DST alert changes.

Clocker/Panel/Data Layer/TimezoneDataOperations.swift

@@ -33,6 +33,32 @@ extension TimezoneDataOperations {
         return dateFormatter.string(from: newDate)
     }
 
+    func nextDaylightSavingsTransitionIfAvailable(with sliderValue: Int) -> String? {
+        let currentTimezone = TimeZone(identifier: dataObject.timezone())
+        guard let nextDaylightSavingsTransition = currentTimezone?.nextDaylightSavingTimeTransition else {
+            return nil
+        }
+
+        guard let newDate = TimezoneDataOperations.gregorianCalendar?.date(byAdding: .minute,
+                                                                           value: sliderValue,
+                                                                           to: Date(),
+                                                                           options: .matchFirst) else {
+            assertionFailure("Data was unexpectedly nil")
+            return nil
+        }
+
+        let calendar = Calendar.autoupdatingCurrent
+        let numberOfDays = nextDaylightSavingsTransition.days(from: newDate, calendar: calendar)
+
+        // We'd like to show upcoming DST changes within the 7 day range.
+        // Using 8 as a fail-safe as timezones behind CDT can sometimes be wrongly attributed
+        if numberOfDays > 8 || numberOfDays <= 0 {
+            return nil
+        }
+
+        return "Daylight Savings transition will occur in \(numberOfDays) days!"
+    }
+
     private func checkForUpcomingEvents() -> (String, String)? {
         if DataStore.shared().shouldDisplay(.showMeetingInMenubar) {
             let filteredDates = EventCenter.sharedCenter().eventsForDate

Clocker/Panel/UI/TimezoneCellView.swift

@@ -149,7 +149,7 @@ class TimezoneCellView: NSTableCellView {
         let timeWidth = timeString.size(withAttributes: [NSAttributedString.Key.font: customTimeFont]).width
 
         for constraint in time.constraints {
-          constraint.constant = constraint.identifier == "height" ? timeHeight : timeWidth
+            constraint.constant = constraint.identifier == "height" ? timeHeight : timeWidth
         }
     }
 

Clocker/Panel/UI/TimezoneDataSource.swift

@@ -58,11 +58,17 @@ extension TimezoneDataSource: NSTableViewDataSource, NSTableViewDelegate {
         cellView.rowNumber = row
         cellView.customName.stringValue = currentModel.formattedTimezoneLabel()
         cellView.time.stringValue = operation.time(with: sliderValue)
-        cellView.noteLabel.stringValue = currentModel.note ?? CLEmptyString
         cellView.noteLabel.toolTip = currentModel.note ?? CLEmptyString
         cellView.currentLocationIndicator.isHidden = !currentModel.isSystemTimezone
         cellView.time.setAccessibilityIdentifier("ActualTime")
         cellView.relativeDate.setAccessibilityIdentifier("RelativeDate")
+        if let note = currentModel.note, !note.isEmpty {
+            cellView.noteLabel.stringValue = note
+        } else if let value = operation.nextDaylightSavingsTransitionIfAvailable(with: sliderValue) {
+            cellView.noteLabel.stringValue = value
+        } else {
+            cellView.noteLabel.stringValue = CLEmptyString
+        }
         cellView.layout(with: currentModel)
 
         cellView.setAccessibilityIdentifier(currentModel.formattedTimezoneLabel())
@@ -78,6 +84,7 @@ extension TimezoneDataSource: NSTableViewDataSource, NSTableViewDelegate {
 
         if let userFontSize = DataStore.shared().retrieve(key: CLUserFontSizePreference) as? NSNumber, timezones.count > row, let relativeDisplay = DataStore.shared().retrieve(key: CLRelativeDateKey) as? NSNumber {
             let model = timezones[row]
+            let operation = TimezoneDataOperations(with: model)
             let shouldShowSunrise = DataStore.shared().shouldDisplay(.sunrise)
 
             var rowHeight: Int = userFontSize == 4 ? 60 : 65
@@ -91,7 +98,9 @@ extension TimezoneDataSource: NSTableViewDataSource, NSTableViewDelegate {
             }
 
             if let note = model.note, !note.isEmpty {
-                rowHeight += userFontSize.intValue + 25
+                rowHeight += userFontSize.intValue + 15
+            } else if operation.nextDaylightSavingsTransitionIfAvailable(with: sliderValue) != nil {
+                rowHeight += userFontSize.intValue + 15
             }
 
             if model.isSystemTimezone {