diff --git a/Base.lproj/MainMenu.xib b/Base.lproj/MainMenu.xib
index 854465c55..8ca33ddec 100644
--- a/Base.lproj/MainMenu.xib
+++ b/Base.lproj/MainMenu.xib
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="18122" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES">
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="17701" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES">
     <dependencies>
         <deployment identifier="macosx"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="18122"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="17701"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>
@@ -18,7 +18,7 @@
             <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
             <windowCollectionBehavior key="collectionBehavior" fullScreenPrimary="YES"/>
             <rect key="contentRect" x="331" y="367" width="1000" height="400"/>
-            <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1415"/>
+            <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1417"/>
             <value key="minSize" type="size" width="750" height="200"/>
             <stackView key="contentView" distribution="equalSpacing" orientation="vertical" alignment="centerX" spacing="0.0" detachesHiddenViews="YES" id="2">
                 <rect key="frame" x="0.0" y="0.0" width="1000" height="400"/>
@@ -46,7 +46,8 @@
                                                         <color key="textColor" name="headerTextColor" catalog="System" colorSpace="catalog"/>
                                                         <color key="backgroundColor" white="0.33333299" alpha="1" colorSpace="calibratedWhite"/>
                                                     </tableHeaderCell>
-                                                    <textFieldCell key="dataCell" lineBreakMode="truncatingTail" selectable="YES" editable="YES" alignment="right" title="Text Cell" id="1507">
+                                                    <textFieldCell key="dataCell" lineBreakMode="truncatingTail" selectable="YES" editable="YES" alignment="right" id="1507" customClass="MonospacedDigitTextFieldCell">
+                                                        <customFormatter key="formatter" id="nTf-SH-hvf" customClass="IndexFormatter"/>
                                                         <font key="font" metaFont="system"/>
                                                         <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
                                                         <color key="backgroundColor" name="controlBackgroundColor" catalog="System" colorSpace="catalog"/>
@@ -147,16 +148,18 @@
                                                         <color key="textColor" name="headerTextColor" catalog="System" colorSpace="catalog"/>
                                                         <color key="backgroundColor" name="headerColor" catalog="System" colorSpace="catalog"/>
                                                     </tableHeaderCell>
-                                                    <textFieldCell key="dataCell" lineBreakMode="truncatingTail" selectable="YES" editable="YES" alignment="right" title="Text Cell" id="1510">
+                                                    <textFieldCell key="dataCell" lineBreakMode="truncatingTail" selectable="YES" editable="YES" alignment="right" id="1510" customClass="MonospacedDigitTextFieldCell">
+                                                        <customFormatter key="formatter" id="tMx-da-cg2" customClass="SecondsFormatter"/>
                                                         <font key="font" metaFont="system"/>
                                                         <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
                                                         <color key="backgroundColor" name="controlBackgroundColor" catalog="System" colorSpace="catalog"/>
                                                     </textFieldCell>
                                                     <tableColumnResizingMask key="resizingMask" resizeWithTable="YES" userResizable="YES"/>
                                                     <connections>
-                                                        <binding destination="218" name="value" keyPath="arrangedObjects.length" id="1658">
+                                                        <binding destination="218" name="value" keyPath="arrangedObjects.length" id="3wK-vR-bZH">
                                                             <dictionary key="options">
-                                                                <integer key="NSConditionallySetsEditable" value="1"/>
+                                                                <bool key="NSConditionallySetsEditable" value="YES"/>
+                                                                <string key="NSNullPlaceholder">0</string>
                                                             </dictionary>
                                                         </binding>
                                                         <binding destination="1689" name="fontSize" keyPath="values.fontSize" id="1919"/>
@@ -167,7 +170,8 @@
                                                         <color key="textColor" name="headerTextColor" catalog="System" colorSpace="catalog"/>
                                                         <color key="backgroundColor" name="headerColor" catalog="System" colorSpace="catalog"/>
                                                     </tableHeaderCell>
-                                                    <textFieldCell key="dataCell" lineBreakMode="truncatingTail" selectable="YES" editable="YES" alignment="right" title="Text Cell" id="1511">
+                                                    <textFieldCell key="dataCell" lineBreakMode="truncatingTail" selectable="YES" editable="YES" alignment="right" id="1511" customClass="MonospacedDigitTextFieldCell">
+                                                        <customFormatter key="formatter" id="uVF-7t-Nw2" customClass="BlankZeroFormatter"/>
                                                         <font key="font" metaFont="system"/>
                                                         <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
                                                         <color key="backgroundColor" name="controlBackgroundColor" catalog="System" colorSpace="catalog"/>
@@ -200,7 +204,8 @@
                                                         <color key="textColor" name="headerTextColor" catalog="System" colorSpace="catalog"/>
                                                         <color key="backgroundColor" name="headerColor" catalog="System" colorSpace="catalog"/>
                                                     </tableHeaderCell>
-                                                    <textFieldCell key="dataCell" lineBreakMode="truncatingTail" selectable="YES" editable="YES" alignment="right" title="Text Cell" id="1513">
+                                                    <textFieldCell key="dataCell" lineBreakMode="truncatingTail" selectable="YES" editable="YES" alignment="right" id="1513" customClass="MonospacedDigitTextFieldCell">
+                                                        <customFormatter key="formatter" id="QXs-TV-W1R" customClass="BlankZeroFormatter"/>
                                                         <font key="font" metaFont="system"/>
                                                         <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
                                                         <color key="backgroundColor" name="controlBackgroundColor" catalog="System" colorSpace="catalog"/>
@@ -291,7 +296,7 @@
                         </connections>
                     </splitView>
                     <textField verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="778">
-                        <rect key="frame" x="370" y="4" width="261" height="14"/>
+                        <rect key="frame" x="369" y="4" width="262" height="14"/>
                         <textFieldCell key="cell" controlSize="small" lineBreakMode="truncatingTail" sendsActionOnEndEditing="YES" alignment="center" title="Total Duration: 00 hours 00 minutes 00 seconds" bezelStyle="round" id="1473">
                             <font key="font" metaFont="controlContent" size="11"/>
                             <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
@@ -412,10 +417,10 @@
                     <toolbarItem implicitItemIdentifier="B042D8A5-AFF4-43B2-9DFB-E87A09B7F861" label="Current Time" paletteLabel="Current Time" visibilityPriority="5" sizingBehavior="auto" id="1568">
                         <nil key="toolTip"/>
                         <textField key="view" verticalHuggingPriority="750" id="1566" customClass="TimeField">
-                            <rect key="frame" x="14" y="14" width="49" height="19"/>
+                            <rect key="frame" x="8" y="14" width="61" height="22"/>
                             <autoresizingMask key="autoresizingMask"/>
-                            <textFieldCell key="cell" controlSize="small" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" borderStyle="bezel" alignment="center" title="0:00" usesSingleLineMode="YES" bezelStyle="round" id="1567">
-                                <font key="font" metaFont="message" size="11"/>
+                            <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" borderStyle="bezel" alignment="center" title="0:00" usesSingleLineMode="YES" bezelStyle="round" id="1567" customClass="MonospacedDigitTextFieldCell">
+                                <font key="font" metaFont="system"/>
                                 <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
                                 <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
                             </textFieldCell>
@@ -567,7 +572,7 @@
         <window title="Cog" separatorStyle="none" allowsToolTipsWhenApplicationIsInactive="NO" releasedWhenClosed="NO" visibleAtLaunch="NO" frameAutosaveName="Mini Window" animationBehavior="default" toolbarStyle="unified" id="2234" userLabel="Mini Window (Window)" customClass="MiniWindow">
             <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
             <rect key="contentRect" x="192" y="547" width="640" height="0.0"/>
-            <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1415"/>
+            <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1417"/>
             <view key="contentView" hidden="YES" wantsLayer="YES" id="2235">
                 <rect key="frame" x="0.0" y="0.0" width="640" height="0.0"/>
                 <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
@@ -1443,7 +1448,6 @@ Gw
                 <string>status</string>
                 <mutableString>queued</mutableString>
             </declaredKeys>
-            <classReference key="objectClass" className="PlaylistEntry"/>
             <connections>
                 <outlet property="playbackController" destination="705" id="2121"/>
                 <outlet property="playlistLoader" destination="1319" id="1321"/>
@@ -1763,7 +1767,6 @@ Gw
                 <mutableString>title</mutableString>
                 <mutableString>artist</mutableString>
             </declaredKeys>
-            <classReference key="objectClass" className="PlaylistEntry"/>
             <connections>
                 <binding destination="218" name="contentObject" keyPath="currentEntry" id="1902"/>
             </connections>
@@ -1775,7 +1778,6 @@ Gw
                 <string>artist</string>
                 <string>album</string>
             </declaredKeys>
-            <classReference key="objectClass" className="PlaylistEntry"/>
             <connections>
                 <binding destination="218" name="contentArray" keyPath="arrangedObjects" id="2039"/>
                 <binding destination="218" name="selectionIndexes" keyPath="selectionIndexes" id="2041"/>
@@ -1801,152 +1803,152 @@ Gw
         <image name="imageCell:1801:image" width="17" height="17">
             <mutableData key="keyedArchiveRepresentation">
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diff --git a/Cog.xcodeproj/project.pbxproj b/Cog.xcodeproj/project.pbxproj
index 9e80da785..e78a5c0db 100644
--- a/Cog.xcodeproj/project.pbxproj
+++ b/Cog.xcodeproj/project.pbxproj
@@ -90,6 +90,10 @@
 		17F561400C3BD4F30019975C /* CogAudio.framework in CopyFiles */ = {isa = PBXBuildFile; fileRef = 17F561330C3BD4DC0019975C /* CogAudio.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, ); }; };
 		17F6C8070F603701000D9DA9 /* PlaybackEventController.m in Sources */ = {isa = PBXBuildFile; fileRef = 17F6C8060F603701000D9DA9 /* PlaybackEventController.m */; };
 		17FAEBAC0F662985007C8707 /* ToolTipTextField.m in Sources */ = {isa = PBXBuildFile; fileRef = 17FAEBAB0F662985007C8707 /* ToolTipTextField.m */; };
+		3D42D1302641739C002A170C /* MonospacedDigitTextFieldCell.m in Sources */ = {isa = PBXBuildFile; fileRef = 3D42D12F2641739C002A170C /* MonospacedDigitTextFieldCell.m */; };
+		3D42D1B82642BB62002A170C /* CogTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 3D42D1B72642BB62002A170C /* CogTests.m */; };
+		3D42D2772642BEA0002A170C /* SecondsFormatterTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 3D42D2762642BEA0002A170C /* SecondsFormatterTests.m */; };
+		3D42D2C12642BF5D002A170C /* SecondsFormatter.m in Sources */ = {isa = PBXBuildFile; fileRef = 17D1B1670F632ABB00694C57 /* SecondsFormatter.m */; };
 		5604D45B0D60349B004F5C5D /* SpotlightWindowController.m in Sources */ = {isa = PBXBuildFile; fileRef = 5604D4590D60349B004F5C5D /* SpotlightWindowController.m */; };
 		5604D4F60D60726E004F5C5D /* SpotlightPlaylistEntry.m in Sources */ = {isa = PBXBuildFile; fileRef = 5604D4F50D60726E004F5C5D /* SpotlightPlaylistEntry.m */; };
 		56462EAF0D6341F6000AB68C /* SpotlightTransformers.m in Sources */ = {isa = PBXBuildFile; fileRef = 56462EAE0D6341F6000AB68C /* SpotlightTransformers.m */; };
@@ -301,6 +305,13 @@
 			remoteGlobalIDString = 8D5B49AC048680CD000E48DA;
 			remoteInfo = Preferences;
 		};
+		3D42D1BA2642BB62002A170C /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 29B97313FDCFA39411CA2CEA /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 8D1107260486CEB800E47090;
+			remoteInfo = Cog;
+		};
 		566D321A0D538550004466A5 /* PBXContainerItemProxy */ = {
 			isa = PBXContainerItemProxy;
 			containerPortal = 566D32160D538550004466A5 /* APL.xcodeproj */;
@@ -789,7 +800,7 @@
 		17E0D5E50F520F02005B6FED /* PositionSlider.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = PositionSlider.h; path = Window/PositionSlider.h; sourceTree = "<group>"; };
 		17E0D5E60F520F02005B6FED /* PositionSlider.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = PositionSlider.m; path = Window/PositionSlider.m; sourceTree = "<group>"; };
 		17E0D5E70F520F02005B6FED /* TimeField.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = TimeField.h; path = Window/TimeField.h; sourceTree = "<group>"; };
-		17E0D5E80F520F02005B6FED /* TimeField.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = TimeField.m; path = Window/TimeField.m; sourceTree = "<group>"; };
+		17E0D5E80F520F02005B6FED /* TimeField.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = TimeField.m; path = Window/TimeField.m; sourceTree = "<group>"; usesTabs = 0; };
 		17E0D6120F520F87005B6FED /* FontSizetoLineHeightTransformer.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = FontSizetoLineHeightTransformer.h; path = Transformers/FontSizetoLineHeightTransformer.h; sourceTree = "<group>"; };
 		17E0D6130F520F87005B6FED /* FontSizetoLineHeightTransformer.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = FontSizetoLineHeightTransformer.m; path = Transformers/FontSizetoLineHeightTransformer.m; sourceTree = "<group>"; };
 		17E0D6140F520F87005B6FED /* StringToURLTransformer.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = StringToURLTransformer.h; path = Transformers/StringToURLTransformer.h; sourceTree = "<group>"; };
@@ -809,6 +820,14 @@
 		29B97324FDCFA39411CA2CEA /* AppKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = AppKit.framework; path = /System/Library/Frameworks/AppKit.framework; sourceTree = "<absolute>"; };
 		29B97325FDCFA39411CA2CEA /* Foundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Foundation.framework; path = /System/Library/Frameworks/Foundation.framework; sourceTree = "<absolute>"; };
 		32CA4F630368D1EE00C91783 /* Cog_Prefix.pch */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Cog_Prefix.pch; sourceTree = "<group>"; };
+		3D42D12E2641739C002A170C /* MonospacedDigitTextFieldCell.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MonospacedDigitTextFieldCell.h; sourceTree = "<group>"; };
+		3D42D12F2641739C002A170C /* MonospacedDigitTextFieldCell.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MonospacedDigitTextFieldCell.m; sourceTree = "<group>"; };
+		3D42D1B52642BB62002A170C /* CogTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = CogTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
+		3D42D1B72642BB62002A170C /* CogTests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = CogTests.m; sourceTree = "<group>"; };
+		3D42D1B92642BB62002A170C /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		3D42D2742642BEA0002A170C /* SecondsFormatterTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = SecondsFormatterTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
+		3D42D2762642BEA0002A170C /* SecondsFormatterTests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SecondsFormatterTests.m; sourceTree = "<group>"; };
+		3D42D2782642BEA0002A170C /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		3DDFC2462344EC6B000F1453 /* DEVELOPMENT_TEAM.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; path = DEVELOPMENT_TEAM.xcconfig; sourceTree = "<group>"; };
 		3DDFC2472344EC6B000F1453 /* Shared.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; path = Shared.xcconfig; sourceTree = "<group>"; };
 		5604D4590D60349B004F5C5D /* SpotlightWindowController.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = SpotlightWindowController.m; path = Spotlight/SpotlightWindowController.m; sourceTree = "<group>"; };
@@ -935,6 +954,20 @@
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
+		3D42D1B22642BB62002A170C /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		3D42D2712642BEA0002A170C /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		8D11072E0486CEB800E47090 /* Frameworks */ = {
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
@@ -1078,6 +1111,8 @@
 				17FAEBAB0F662985007C8707 /* ToolTipTextField.m */,
 				8355D6B4180612F300D05687 /* NSData+MD5.h */,
 				8355D6B5180612F300D05687 /* NSData+MD5.m */,
+				3D42D12E2641739C002A170C /* MonospacedDigitTextFieldCell.h */,
+				3D42D12F2641739C002A170C /* MonospacedDigitTextFieldCell.m */,
 			);
 			path = Utils;
 			sourceTree = "<group>";
@@ -1323,6 +1358,8 @@
 			isa = PBXGroup;
 			children = (
 				1770424E0B8BC41800B86321 /* Cog.app */,
+				3D42D1B52642BB62002A170C /* CogTests.xctest */,
+				3D42D2742642BEA0002A170C /* SecondsFormatterTests.xctest */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -1335,6 +1372,8 @@
 				080E96DDFE201D6D7F000001 /* Classes */,
 				29B97315FDCFA39411CA2CEA /* Other Sources */,
 				29B97317FDCFA39411CA2CEA /* Resources */,
+				3D42D1B62642BB62002A170C /* CogTests */,
+				3D42D2752642BEA0002A170C /* SecondsFormatterTests */,
 				29B97323FDCFA39411CA2CEA /* Frameworks */,
 				17B619FF0B909ED400BC003F /* PlugIns */,
 				3DDFC2452344EC6A000F1453 /* Xcode-config */,
@@ -1387,6 +1426,24 @@
 			name = Frameworks;
 			sourceTree = "<group>";
 		};
+		3D42D1B62642BB62002A170C /* CogTests */ = {
+			isa = PBXGroup;
+			children = (
+				3D42D1B72642BB62002A170C /* CogTests.m */,
+				3D42D1B92642BB62002A170C /* Info.plist */,
+			);
+			path = CogTests;
+			sourceTree = "<group>";
+		};
+		3D42D2752642BEA0002A170C /* SecondsFormatterTests */ = {
+			isa = PBXGroup;
+			children = (
+				3D42D2762642BEA0002A170C /* SecondsFormatterTests.m */,
+				3D42D2782642BEA0002A170C /* Info.plist */,
+			);
+			path = SecondsFormatterTests;
+			sourceTree = "<group>";
+		};
 		3DDFC2452344EC6A000F1453 /* Xcode-config */ = {
 			isa = PBXGroup;
 			children = (
@@ -1675,6 +1732,41 @@
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
+		3D42D1B42642BB62002A170C /* CogTests */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 3D42D1C02642BB62002A170C /* Build configuration list for PBXNativeTarget "CogTests" */;
+			buildPhases = (
+				3D42D1B12642BB62002A170C /* Sources */,
+				3D42D1B22642BB62002A170C /* Frameworks */,
+				3D42D1B32642BB62002A170C /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+				3D42D1BB2642BB62002A170C /* PBXTargetDependency */,
+			);
+			name = CogTests;
+			productName = CogTests;
+			productReference = 3D42D1B52642BB62002A170C /* CogTests.xctest */;
+			productType = "com.apple.product-type.bundle.unit-test";
+		};
+		3D42D2732642BEA0002A170C /* SecondsFormatterTests */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 3D42D27D2642BEA1002A170C /* Build configuration list for PBXNativeTarget "SecondsFormatterTests" */;
+			buildPhases = (
+				3D42D2702642BEA0002A170C /* Sources */,
+				3D42D2712642BEA0002A170C /* Frameworks */,
+				3D42D2722642BEA0002A170C /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = SecondsFormatterTests;
+			productName = SecondsFormatterTests;
+			productReference = 3D42D2742642BEA0002A170C /* SecondsFormatterTests.xctest */;
+			productType = "com.apple.product-type.bundle.unit-test";
+		};
 		8D1107260486CEB800E47090 /* Cog */ = {
 			isa = PBXNativeTarget;
 			buildConfigurationList = C01FCF4A08A954540054247B /* Build configuration list for PBXNativeTarget "Cog" */;
@@ -1734,6 +1826,17 @@
 			attributes = {
 				LastUpgradeCheck = 1250;
 				TargetAttributes = {
+					3D42D1B42642BB62002A170C = {
+						CreatedOnToolsVersion = 12.4;
+						DevelopmentTeam = "";
+						ProvisioningStyle = Automatic;
+						TestTargetID = 8D1107260486CEB800E47090;
+					};
+					3D42D2732642BEA0002A170C = {
+						CreatedOnToolsVersion = 12.4;
+						DevelopmentTeam = "";
+						ProvisioningStyle = Automatic;
+					};
 					8D1107260486CEB800E47090 = {
 						DevelopmentTeam = "";
 						LastSwiftMigration = 1220;
@@ -1880,6 +1983,8 @@
 			projectRoot = "";
 			targets = (
 				8D1107260486CEB800E47090 /* Cog */,
+				3D42D1B42642BB62002A170C /* CogTests */,
+				3D42D2732642BEA0002A170C /* SecondsFormatterTests */,
 			);
 		};
 /* End PBXProject section */
@@ -2105,6 +2210,20 @@
 /* End PBXReferenceProxy section */
 
 /* Begin PBXResourcesBuildPhase section */
+		3D42D1B32642BB62002A170C /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		3D42D2722642BEA0002A170C /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		8D1107290486CEB800E47090 /* Resources */ = {
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
@@ -2192,6 +2311,23 @@
 /* End PBXShellScriptBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */
+		3D42D1B12642BB62002A170C /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				3D42D1B82642BB62002A170C /* CogTests.m in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		3D42D2702642BEA0002A170C /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				3D42D2772642BEA0002A170C /* SecondsFormatterTests.m in Sources */,
+				3D42D2C12642BF5D002A170C /* SecondsFormatter.m in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		8D11072C0486CEB800E47090 /* Sources */ = {
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
@@ -2256,6 +2392,7 @@
 				17F6C8070F603701000D9DA9 /* PlaybackEventController.m in Sources */,
 				83BC5AB220E4C87100631CD4 /* DualWindow.m in Sources */,
 				1784560F0F631E24007E8021 /* FileTreeViewController.m in Sources */,
+				3D42D1302641739C002A170C /* MonospacedDigitTextFieldCell.m in Sources */,
 				178456120F631E31007E8021 /* SideViewController.m in Sources */,
 				17D1B1010F63255200694C57 /* InfoWindowController.m in Sources */,
 				17D1B1680F632ABB00694C57 /* BlankZeroFormatter.m in Sources */,
@@ -2318,6 +2455,11 @@
 			name = Preferences;
 			targetProxy = 17F5623A0C3BD9280019975C /* PBXContainerItemProxy */;
 		};
+		3D42D1BB2642BB62002A170C /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 8D1107260486CEB800E47090 /* Cog */;
+			targetProxy = 3D42D1BA2642BB62002A170C /* PBXContainerItemProxy */;
+		};
 		834D793020E4EFCC00C4A5CC /* PBXTargetDependency */ = {
 			isa = PBXTargetDependency;
 			name = "VorbisPlugin Plugin";
@@ -2511,6 +2653,142 @@
 /* End PBXVariantGroup section */
 
 /* Begin XCBuildConfiguration section */
+		3D42D1BC2642BB62002A170C /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				INFOPLIST_FILE = CogTests/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = org.cogx.CogTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Cog.app/Contents/MacOS/Cog";
+			};
+			name = Debug;
+		};
+		3D42D1BD2642BB62002A170C /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				COPY_PHASE_STRIP = NO;
+				ENABLE_NS_ASSERTIONS = NO;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				INFOPLIST_FILE = CogTests/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				MTL_FAST_MATH = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = org.cogx.CogTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Cog.app/Contents/MacOS/Cog";
+			};
+			name = Release;
+		};
+		3D42D2792642BEA1002A170C /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				INFOPLIST_FILE = SecondsFormatterTests/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = org.cogx.SecondsFormatterTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+			};
+			name = Debug;
+		};
+		3D42D27A2642BEA1002A170C /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				COPY_PHASE_STRIP = NO;
+				ENABLE_NS_ASSERTIONS = NO;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				INFOPLIST_FILE = SecondsFormatterTests/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				MTL_FAST_MATH = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = org.cogx.SecondsFormatterTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+			};
+			name = Release;
+		};
 		C01FCF4B08A954540054247B /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
@@ -2686,6 +2964,24 @@
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
+		3D42D1C02642BB62002A170C /* Build configuration list for PBXNativeTarget "CogTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				3D42D1BC2642BB62002A170C /* Debug */,
+				3D42D1BD2642BB62002A170C /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		3D42D27D2642BEA1002A170C /* Build configuration list for PBXNativeTarget "SecondsFormatterTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				3D42D2792642BEA1002A170C /* Debug */,
+				3D42D27A2642BEA1002A170C /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 		C01FCF4A08A954540054247B /* Build configuration list for PBXNativeTarget "Cog" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
diff --git a/Cog.xcodeproj/xcshareddata/xcschemes/Cog.xcscheme b/Cog.xcodeproj/xcshareddata/xcschemes/Cog.xcscheme
index 9ef83bc72..5733821aa 100644
--- a/Cog.xcodeproj/xcshareddata/xcschemes/Cog.xcscheme
+++ b/Cog.xcodeproj/xcshareddata/xcschemes/Cog.xcscheme
@@ -37,6 +37,16 @@
          </BuildableReference>
       </MacroExpansion>
       <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "3D42D1B42642BB62002A170C"
+               BuildableName = "CogTests.xctest"
+               BlueprintName = "CogTests"
+               ReferencedContainer = "container:Cog.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
       </Testables>
    </TestAction>
    <LaunchAction
diff --git a/Cog.xcodeproj/xcshareddata/xcschemes/SecondsFormatterTests.xcscheme b/Cog.xcodeproj/xcshareddata/xcschemes/SecondsFormatterTests.xcscheme
new file mode 100644
index 000000000..478910225
--- /dev/null
+++ b/Cog.xcodeproj/xcshareddata/xcschemes/SecondsFormatterTests.xcscheme
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1240"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "3D42D2732642BEA0002A170C"
+               BuildableName = "SecondsFormatterTests.xctest"
+               BlueprintName = "SecondsFormatterTests"
+               ReferencedContainer = "container:Cog.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/CogTests/CogTests.m b/CogTests/CogTests.m
new file mode 100644
index 000000000..c1f4252f9
--- /dev/null
+++ b/CogTests/CogTests.m
@@ -0,0 +1,36 @@
+//
+//  CogTests.m
+//  CogTests
+//
+//  Created by Jan on 05.05.21.
+//
+
+#import <XCTest/XCTest.h>
+
+@interface CogTests : XCTestCase
+
+@end
+
+@implementation CogTests
+
+- (void)setUp {
+    // Put setup code here. This method is called before the invocation of each test method in the class.
+}
+
+- (void)tearDown {
+    // Put teardown code here. This method is called after the invocation of each test method in the class.
+}
+
+- (void)testExample {
+    // This is an example of a functional test case.
+    // Use XCTAssert and related functions to verify your tests produce the correct results.
+}
+
+- (void)testPerformanceExample {
+    // This is an example of a performance test case.
+    [self measureBlock:^{
+        // Put the code you want to measure the time of here.
+    }];
+}
+
+@end
diff --git a/CogTests/Info.plist b/CogTests/Info.plist
new file mode 100644
index 000000000..64d65ca49
--- /dev/null
+++ b/CogTests/Info.plist
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>
diff --git a/Formatters/SecondsFormatter.h b/Formatters/SecondsFormatter.h
index 48a959170..443c7bb5d 100644
--- a/Formatters/SecondsFormatter.h
+++ b/Formatters/SecondsFormatter.h
@@ -24,4 +24,6 @@
 {
 }
 
+- (NSString * _Nullable)stringForTimeInterval:(NSTimeInterval)timeInterval;
+
 @end
diff --git a/Formatters/SecondsFormatter.m b/Formatters/SecondsFormatter.m
index d0f3a8799..ec9e9ac98 100644
--- a/Formatters/SecondsFormatter.m
+++ b/Formatters/SecondsFormatter.m
@@ -20,78 +20,202 @@
 
 #import "SecondsFormatter.h"
 
+#define TWO_GIGASECONDS_IS_ENOUGH 1 // 2 Gs is about 68 years.
+#if TWO_GIGASECONDS_IS_ENOUGH
+	typedef int32_t sec_t; // Type used internally for time values (mostly in seconds).
+	#define PRIsec PRIi32
+	#define SEC_MAX INT32_MAX
+	#define scanSec scanInt
+#else
+	typedef NSInteger sec_t;
+	#define PRIsec "zd"
+	#define SEC_MAX NSIntegerMax
+	#define scanSec scanInteger
+#endif
+
 @implementation SecondsFormatter
 
 - (NSString *) stringForObjectValue:(id)object
 {
-	NSString		*result			= nil;
-	unsigned		value;
-	unsigned		days			= 0;
-	unsigned		hours			= 0;
-	unsigned		minutes			= 0;
-	unsigned		seconds			= 0;
-	
-	if(nil == object || NO == [object isKindOfClass:[NSNumber class]] || isnan([object doubleValue])) {
-		return @"";
+	if (nil == object || NO == [object isKindOfClass:[NSNumber class]]) {
+		// Docs state: “Returns nil if object is not of the correct class.”
+		return nil;
 	}
 	
-	value		= (unsigned)([object doubleValue]);
-
-	seconds		= value % 60;
-	minutes		= value / 60;
+	NSTimeInterval timeInterval = [object doubleValue];
 	
-	while(60 <= minutes) {
+	return [self stringForTimeInterval:timeInterval];
+}
+
+- (NSString * _Nullable)stringForTimeInterval:(NSTimeInterval)timeInterval;
+{
+	if (isnan(timeInterval)) { return @"NaN"; }
+	if (isinf(timeInterval)) { return @"Inf"; }
+	
+	BOOL isNegative = signbit(timeInterval);
+	
+	sec_t totalSeconds = (sec_t)(isNegative ? -timeInterval : timeInterval);
+	
+	sec_t seconds	= totalSeconds % 60;
+	sec_t minutes	= totalSeconds / 60;
+	sec_t hours = 0;
+	sec_t days = 0;
+	
+	while (60 <= minutes) {
 		minutes -= 60;
 		++hours;
 	}
 	
-	while(24 <= hours) {
+	while (24 <= hours) {
 		hours -= 24;
 		++days;
 	}
-
-	if(0 < days) {
-		result = [NSString stringWithFormat:@"%u:%.2u:%.2u:%.2u", days, hours, minutes, seconds];
+	
+	NSString *result = nil;
+	
+	const char *signPrefix = isNegative ? "-" : "";
+	
+	if (0 < days) {
+		result = [NSString stringWithFormat:@"%s" "%" PRIsec ":" "%02" PRIsec ":" "%02" PRIsec ":" "%02" PRIsec "", signPrefix, days, hours, minutes, seconds];
 	}
-	else if(0 < hours) {
-		result = [NSString stringWithFormat:@"%u:%.2u:%.2u", hours, minutes, seconds];
+	else if (0 < hours) {
+		result = [NSString stringWithFormat:@"%s" "%" PRIsec ":" "%02" PRIsec ":" "%02" PRIsec "", signPrefix, hours, minutes, seconds];
 	}
-	else if(0 < minutes) {
-		result = [NSString stringWithFormat:@"%u:%.2u", minutes, seconds];
+	else if (0 < minutes) {
+		result = [NSString stringWithFormat:@"%s" "%" PRIsec ":" "%02" PRIsec "", signPrefix, minutes, seconds];
 	}
 	else {
-		result = [NSString stringWithFormat:@"0:%.2u", seconds];
+		result = [NSString stringWithFormat:@"%s" "0:" "%02" PRIsec "", signPrefix, seconds];
 	}
 	
 	return result;
 }
 
-- (BOOL) getObjectValue:(id *)object forString:(NSString *)string errorDescription:(NSString  **)error
+- (BOOL)getObjectValue:(out id  _Nullable __autoreleasing *)object
+			 forString:(NSString *)string
+	  errorDescription:(out NSString * _Nullable __autoreleasing *)error
 {
-	NSScanner		*scanner		= nil;
-	BOOL			result			= NO;
-	int				value			= 0;
-	unsigned		seconds			= 0;
-
-	scanner		= [NSScanner scannerWithString:string];
+	// In the previous implementation,
+	// all types were incorrectly treated indentically.
+	// This made the code much simpler,
+	// but the added complexity is needed to support both negative and large values.
 	
-	while(NO == [scanner isAtEnd]) {
+	NSScanner *scanner = [NSScanner scannerWithString:string];
+	
+	BOOL malformed = NO;
+
+	const int segmentCount = 4;
+	const int lastSegment = segmentCount - 1;
+	sec_t segments[segmentCount] = {-1, -1, -1, -1};
+	int lastScannedSegment = -1;
+
+	BOOL isNegative = NO;
+	
+	if ([scanner isAtEnd] == NO) {
+		isNegative = [scanner scanString:@"-" intoString:NULL];
 		
-		// Grab a value
-		if([scanner scanInt:&value]) {
-			seconds		*= 60;
-			seconds		+= value;
-			result		= YES;
+		int segmentIndex = 0;
+		
+		while ([scanner isAtEnd] == NO) {
+			// Grab a value
+			if ([scanner scanSec:&(segments[segmentIndex])] == NO) {
+				segments[segmentIndex] = -1;
+				malformed = YES;
+				break;
+			}
+			
+			if (segmentIndex == lastSegment) {
+				break;
+			}
+			
+			// Grab the separator, if present
+			if ([scanner scanString:@":" intoString:NULL] == NO) {
+				break;
+			}
+			
+			segmentIndex += 1;
 		}
 		
-		// Grab the separator, if present
-		[scanner scanString:@":" intoString:NULL];
+		lastScannedSegment = segmentIndex;
 	}
 	
-	if(result && NULL != object) {
-		*object = [NSNumber numberWithUnsignedInt:seconds];
+	if ([scanner isAtEnd] == NO) {
+		malformed = YES;
 	}
-	else if(NULL != error) {
+	
+	sec_t seconds = 0;
+	
+	if (malformed == NO) {
+		// `segments` entries need to be mapped to the correct unit type.
+		// The position of each type depends on the number of scanned segments.
+		
+		const int typeCount = segmentCount;
+		
+		typedef enum : int {
+			DAYS = 0, HOURS = 1, MINUTES = 2, SECONDS = 3,
+		} SegmentType;
+		
+		const int segmentIndexes[segmentCount][typeCount] = {
+			{ -1, -1, -1,  0 },
+			{ -1, -1,  0,  1 },
+			{ -1,  0,  1,  2 },
+			{  0,  1,  2,  3 },
+		};
+		
+#define HAS_SEGMENT(segmentType) \
+		(segmentIndexes[lastScannedSegment][(segmentType)] >= 0)
+		
+		typedef struct {
+			sec_t max;
+			sec_t scaleFactor;
+		} SegmentMetadata;
+		
+		const SegmentMetadata segmentMetadata[segmentCount] = {
+			{.max = SEC_MAX,	.scaleFactor = 24},
+			{.max = 24,			.scaleFactor = 60},
+			{.max = 60,			.scaleFactor = 60},
+			{.max = 60,			.scaleFactor =  1},
+		};
+		
+		for (SegmentType segmentType = DAYS; segmentType < segmentCount; segmentType += 1) {
+			if (!HAS_SEGMENT(segmentType)) {
+				if (segmentType == SECONDS) {
+					// Must have SECONDS.
+					malformed = YES;
+					break;
+				}
+				else {
+					continue;
+				}
+			}
+			
+			const int index = segmentIndexes[lastScannedSegment][segmentType];
+			
+			const SegmentMetadata metadata = segmentMetadata[segmentType];
+			
+			if ((segments[index] >= 0) && (segments[index] < metadata.max)) {
+				seconds += segments[index];
+				seconds *= metadata.scaleFactor;
+			}
+			else {
+				malformed = YES;
+				break;
+			}
+		}
+		
+		seconds *= (isNegative ? -1 : 1);
+	}
+	
+	const BOOL result = (malformed == NO);
+	
+	if (result && NULL != object) {
+		NSTimeInterval timeInterval = (NSTimeInterval)seconds;
+		// NOTE: The floating point standard has support for negative zero.
+		// We use that to represent the parsing result without information loss.
+		if (isNegative && (timeInterval == 0.0)) { timeInterval = -0.0; }
+		*object = @(timeInterval);
+	}
+	else if (NULL != error) {
 		*error = @"Couldn't convert value to seconds";
 	}
 	
@@ -100,9 +224,11 @@
 
 - (NSAttributedString *) attributedStringForObjectValue:(id)object withDefaultAttributes:(NSDictionary *)attributes
 {
-	NSAttributedString		*result		= nil;
+	NSString *stringValue = [self stringForObjectValue:object];
+	if(nil == stringValue)
+		return nil;
 	
-	result = [[NSAttributedString alloc] initWithString:[self stringForObjectValue:object] attributes:attributes];
+	NSAttributedString *result = [[NSAttributedString alloc] initWithString:stringValue attributes:attributes];
 	return result;
 }
 
diff --git a/Playlist/PlaylistView.m b/Playlist/PlaylistView.m
index 949a53882..20d4bdd45 100644
--- a/Playlist/PlaylistView.m
+++ b/Playlist/PlaylistView.m
@@ -24,7 +24,14 @@
 - (void)awakeFromNib {
     [[self menu] setAutoenablesItems:NO];
 
+#if 0
     // Configure bindings to scale font size and row height
+    // NOTE: This currently seems to be without effect.
+    // NSFont value overwritten by
+    // -[NSDisplayFontBinder _adjustFontOfObject:mode:triggerRedisplay:compareDirectly:toFont:]
+    // called by
+    // -[NSWindow makeKeyAndOrderFront:]
+	
     NSControlSize s = NSControlSizeSmall;
     NSFont *f = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:s]];
     // NSFont *bf = [[NSFontManager sharedFontManager] convertFont:f toHaveTrait:NSBoldFontMask];
@@ -33,18 +40,7 @@
         [[col dataCell] setControlSize:s];
         [[col dataCell] setFont:f];
     }
-
-    // Set up formatters
-    NSFormatter *secondsFormatter = [[SecondsFormatter alloc] init];
-    [[[self tableColumnWithIdentifier:@"length"] dataCell] setFormatter:secondsFormatter];
-
-    NSFormatter *indexFormatter = [[IndexFormatter alloc] init];
-    [[[self tableColumnWithIdentifier:@"index"] dataCell] setFormatter:indexFormatter];
-
-    NSFormatter *blankZeroFormatter = [[BlankZeroFormatter alloc] init];
-    [[[self tableColumnWithIdentifier:@"track"] dataCell] setFormatter:blankZeroFormatter];
-    [[[self tableColumnWithIdentifier:@"year"] dataCell] setFormatter:blankZeroFormatter];
-    // end setting up formatters
+#endif
 
     [self setVerticalMotionCanBeginDrag:YES];
 
diff --git a/SecondsFormatterTests/Info.plist b/SecondsFormatterTests/Info.plist
new file mode 100644
index 000000000..64d65ca49
--- /dev/null
+++ b/SecondsFormatterTests/Info.plist
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>
diff --git a/SecondsFormatterTests/SecondsFormatterTests.m b/SecondsFormatterTests/SecondsFormatterTests.m
new file mode 100644
index 000000000..108c54180
--- /dev/null
+++ b/SecondsFormatterTests/SecondsFormatterTests.m
@@ -0,0 +1,131 @@
+//
+//  SecondsFormatterTests.m
+//  SecondsFormatterTests
+//
+//  Created by Jan on 05.05.21.
+//
+
+#import <XCTest/XCTest.h>
+
+#import "SecondsFormatter.h"
+
+@interface SecondsFormatterTests : XCTestCase
+
+@end
+
+@implementation SecondsFormatterTests
+
+- (void)setUp
+{
+	[super setUp];
+	// Put setup code here. This method is called before the invocation of each test method in the class.
+}
+
+- (void)tearDown
+{
+	// Put teardown code here. This method is called after the invocation of each test method in the class.
+	[super tearDown];
+}
+
+- (void)testPositive
+{
+	NSDictionary *testsDict =
+	@{
+		// key: test name, value: test string
+		@"Zero": @"0:00",
+		@"One Second": @"0:01",
+		@"One Minute": @"1:00",
+		@"One Hour": @"1:00:00",
+		@"One Day": @"1:00:00:00",
+		@"One of Each": @"1:01:01:01",
+	};
+	
+#define TEST_INFO	@"Test name: %@, Source string: %@", testName, string
+	
+	NSFormatter *secondsFormatter = [[SecondsFormatter alloc] init];
+
+	[testsDict enumerateKeysAndObjectsUsingBlock:
+	 ^(NSString *testName, NSString *string, BOOL * _Nonnull stop) {
+		NSNumber *value;
+		BOOL result =
+		[secondsFormatter getObjectValue:&value
+							   forString:string
+						errorDescription:NULL];
+		XCTAssertTrue(result, TEST_INFO);
+		NSString *timeString = [secondsFormatter stringForObjectValue:value];
+		XCTAssertEqualObjects(string, timeString, TEST_INFO);
+	}];
+}
+
+- (void)testNegative
+{
+	NSDictionary *testsDict =
+	@{
+		// key: test name, value: test string
+		@"Negative Zero": @"-0:00",
+		@"Negative One Second": @"-0:01",
+		@"Negative One Minute": @"-1:00",
+		@"Negative One Hour": @"-1:00:00",
+		@"Negative One Day": @"-1:00:00:00",
+		@"Negative One of Each": @"-1:01:01:01",
+	};
+	
+#define TEST_INFO	@"Test name: %@, Source string: %@", testName, string
+	
+	NSFormatter *secondsFormatter = [[SecondsFormatter alloc] init];
+	
+	[testsDict enumerateKeysAndObjectsUsingBlock:
+	 ^(NSString *testName, NSString *string, BOOL * _Nonnull stop) {
+		NSNumber *value;
+		BOOL result =
+		[secondsFormatter getObjectValue:&value
+							   forString:string
+						errorDescription:NULL];
+		XCTAssertTrue(result, TEST_INFO);
+		NSString *timeString = [secondsFormatter stringForObjectValue:value];
+		XCTAssertEqualObjects(string, timeString, TEST_INFO);
+	}];
+}
+
+- (void)testMalformed
+{
+	NSDictionary *testsDict =
+	@{
+		// key: test name, value: test string
+		@"Empty String": @"",
+		@"Random String": @"abc",
+		@"Solitary Minus": @"-",
+		@"Malformed Seconds": @"0:60",
+		@"Malformed Minutes": @"60:00",
+		@"Malformed Hours": @"24:00:00",
+		@"Illegal #1": @":00",
+		@"Illegal #2": @"-:00",
+	};
+	
+#define TEST_INFO	@"Test name: %@, Source string: %@", testName, string
+	
+	NSFormatter *secondsFormatter = [[SecondsFormatter alloc] init];
+	
+	[testsDict enumerateKeysAndObjectsUsingBlock:
+	 ^(NSString *testName, NSString *string, BOOL * _Nonnull stop) {
+		NSNumber *value;
+		BOOL result =
+		[secondsFormatter getObjectValue:&value
+							   forString:string
+						errorDescription:NULL];
+		XCTAssertFalse(result, TEST_INFO);
+	}];
+}
+
+
+#if 0
+- (void)testPerformanceExample
+{
+	// This is an example of a performance test case.
+	[self measureBlock:^{
+		// Put the code you want to measure the time of here.
+	}];
+}
+#endif
+
+@end
diff --git a/Utils/MonospacedDigitTextFieldCell.h b/Utils/MonospacedDigitTextFieldCell.h
new file mode 100644
index 000000000..21b876b07
--- /dev/null
+++ b/Utils/MonospacedDigitTextFieldCell.h
@@ -0,0 +1,18 @@
+//
+//  MonospacedDigitTextFieldCell.h
+//  Cog
+//
+//  Created by Jan on 04.05.21.
+//
+
+#import <Cocoa/Cocoa.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MonospacedDigitTextFieldCell : NSTextFieldCell {
+	
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Utils/MonospacedDigitTextFieldCell.m b/Utils/MonospacedDigitTextFieldCell.m
new file mode 100644
index 000000000..1ddf84837
--- /dev/null
+++ b/Utils/MonospacedDigitTextFieldCell.m
@@ -0,0 +1,23 @@
+//
+//  MonospacedDigitTextFieldCell.m
+//  Cog
+//
+//  Created by Jan on 04.05.21.
+//
+
+#import "MonospacedDigitTextFieldCell.h"
+
+@implementation MonospacedDigitTextFieldCell
+
+- (void)setFont:(NSFont *)font
+{
+	CGFloat size = font.pointSize;
+	
+	NSNumber *weightNum = [font.fontDescriptor objectForKey:NSFontWeightTrait];
+	NSFontWeight weight = weightNum ? weightNum.doubleValue : NSFontWeightRegular;
+	
+	super.font = [NSFont monospacedDigitSystemFontOfSize:size
+												  weight:weight];
+}
+
+@end
diff --git a/Window/PositionSlider.m b/Window/PositionSlider.m
index d857af3e7..790cd72d1 100644
--- a/Window/PositionSlider.m
+++ b/Window/PositionSlider.m
@@ -13,21 +13,21 @@
 
 - (void)setDoubleValue:(double)value
 {
-    self.positionTextField.currentTime = (long)value;
+    self.positionTextField.currentTime = value;
 
     [super setDoubleValue:value];
 }
 
 - (void)setMaxValue:(double)value
 {
-    self.positionTextField.duration = (long)value;
+    self.positionTextField.duration = value;
 
     [super setMaxValue:value];
 }
 
 - (void)mouseDragged:(NSEvent *)theEvent
 {
-    self.positionTextField.currentTime = (long)[self doubleValue];
+    self.positionTextField.currentTime = [self doubleValue];
 
     [super mouseDragged:theEvent];
 }
diff --git a/Window/TimeField.h b/Window/TimeField.h
index fd709e4b7..4e6f07b3a 100644
--- a/Window/TimeField.h
+++ b/Window/TimeField.h
@@ -11,7 +11,7 @@
 
 @interface TimeField : NSTextField
 
-@property (nonatomic) NSInteger currentTime;
-@property (nonatomic) NSInteger duration;
+@property (nonatomic) NSTimeInterval currentTime;
+@property (nonatomic) NSTimeInterval duration;
 
 @end
diff --git a/Window/TimeField.m b/Window/TimeField.m
index e15dc3ff3..ad2f04356 100644
--- a/Window/TimeField.m
+++ b/Window/TimeField.m
@@ -8,26 +8,46 @@
 
 #import "TimeField.h"
 
+#import "SecondsFormatter.h"
+
+
 static NSString *kTimerModeKey = @"timerShowTimeRemaining";
 
-NSString * formatTimer(long minutes, long seconds, unichar prefix) {
-    return [NSString localizedStringWithFormat:@"%C%lu:%02lu", prefix, minutes, seconds];;
-}
 
 @implementation TimeField {
     BOOL showTimeRemaining;
     NSDictionary *fontAttributes;
+    SecondsFormatter *secondsFormatter;
 }
 
+- (instancetype)initWithCoder:(NSCoder *)aDecoder
+{
+    if (self = [super initWithCoder:aDecoder])
+    {
+        [self commonInit];
+    }
+    
+    return self;
+}
+
+- (instancetype)initWithFrame:(CGRect)frame
+{
+    if (self = [super initWithFrame:frame])
+    {
+        [self commonInit];
+    }
+    
+    return self;
+}
+
+- (void)commonInit
+{
+    secondsFormatter = [[SecondsFormatter alloc] init];
+}
+    
 - (void)awakeFromNib
 {
     showTimeRemaining = [[NSUserDefaults standardUserDefaults] boolForKey:kTimerModeKey];
-    if (@available(macOS 10.15, *)) {
-        fontAttributes =
-            @{NSFontAttributeName : [NSFont monospacedSystemFontOfSize:13
-                                                                weight:NSFontWeightMedium]};
-        [self update];
-    }
 }
 
 - (void)update
@@ -35,13 +55,16 @@ NSString * formatTimer(long minutes, long seconds, unichar prefix) {
     NSString *text;
     if (showTimeRemaining == NO)
     {
-        long sec = self.currentTime;
-        text = formatTimer(sec / 60, sec % 60, 0x2007); // Digit-width space
+		NSTimeInterval sec = self.currentTime;
+        text = [secondsFormatter stringForTimeInterval:sec];
     }
     else
     {
-        long sec = MAX(0, self.duration - self.currentTime);
-        text = formatTimer(sec / 60, sec % 60, 0x2012); // Hyphen
+		NSTimeInterval sec = self.currentTime - self.duration;
+		// NOTE: The floating point standard has support for negative zero.
+		// We use that to enforce the sign prefix.
+		if (sec == 0.0) { sec = -0.0; }
+        text = [secondsFormatter stringForTimeInterval:sec];
     }
     NSAttributedString *string = [[NSAttributedString alloc] initWithString:text
                                                                  attributes:fontAttributes];
@@ -55,7 +78,7 @@ NSString * formatTimer(long minutes, long seconds, unichar prefix) {
     [self update];
 }
 
-- (void)setCurrentTime:(NSInteger)currentTime
+- (void)setCurrentTime:(NSTimeInterval)currentTime
 {
     _currentTime = currentTime;
     [self update];