Use live calendars for day selection

Switch selected-day and day-range logic to Calendar.autoupdatingCurrent so timezone changes update the active day without a restart. Add a rollover test for moving from Los Angeles to Seoul.

Author: ComputelessComputer

Sources/OpenbirdApp/AppModel.swift

@@ -374,7 +374,7 @@ final class AppModel: ObservableObject {
     }
 
     var googleDocsCaptureHint: GoogleDocsCaptureHint? {
-        guard Calendar.current.isDateInToday(selectedDay) else {
+        guard Calendar.autoupdatingCurrent.isDateInToday(selectedDay) else {
             return nil
         }
 
@@ -424,7 +424,7 @@ final class AppModel: ObservableObject {
         from selectedDay: Date,
         previousCurrentDay: Date,
         now: Date,
-        calendar: Calendar = .current
+        calendar: Calendar = .autoupdatingCurrent
     ) -> Date? {
         let currentDay = calendar.startOfDay(for: now)
         guard calendar.isDate(currentDay, inSameDayAs: previousCurrentDay) == false else {
@@ -535,7 +535,7 @@ final class AppModel: ObservableObject {
                 availableProviderModels = []
             }
 
-            let dayRange = Calendar.current.dayRange(for: requestedDay)
+            let dayRange = Calendar.autoupdatingCurrent.dayRange(for: requestedDay)
             let day = OpenbirdDateFormatting.dayString(for: requestedDay)
             dayLoadStatus = Self.makeDayLoadStatus(
                 step: 2,
@@ -1300,7 +1300,7 @@ final class AppModel: ObservableObject {
     func sendChat() {
         let question = chatInput.trimmingCharacters(in: .whitespacesAndNewlines)
         guard let thread = chatThread, question.isEmpty == false, isSendingChat == false else { return }
-        let requestedDayRange = Calendar.current.dayRange(for: selectedDay)
+        let requestedDayRange = Calendar.autoupdatingCurrent.dayRange(for: selectedDay)
 
         let userMessage = ChatMessage(threadID: thread.id, role: .user, content: question)
         let assistantPlaceholder = ChatMessage(threadID: thread.id, role: .assistant, content: "")
@@ -1348,7 +1348,7 @@ final class AppModel: ObservableObject {
 
     func selectDay(_ day: Date) {
         let normalizedDay = Self.startOfDay(for: day)
-        guard Calendar.current.isDate(selectedDay, inSameDayAs: normalizedDay) == false else {
+        guard Calendar.autoupdatingCurrent.isDate(selectedDay, inSameDayAs: normalizedDay) == false else {
             return
         }
 
@@ -1360,7 +1360,7 @@ final class AppModel: ObservableObject {
     }
 
     func handleCurrentDayChangeIfNeeded(now: Date = Date()) {
-        let calendar = Calendar.current
+        let calendar = Calendar.autoupdatingCurrent
         let currentDay = Self.startOfDay(for: now, calendar: calendar)
         guard calendar.isDate(currentDay, inSameDayAs: currentDayAnchor) == false else {
             return
@@ -1395,7 +1395,7 @@ final class AppModel: ObservableObject {
             return
         }
 
-        guard Calendar.current.isDate(selectedDay, inSameDayAs: now) else {
+        guard Calendar.autoupdatingCurrent.isDate(selectedDay, inSameDayAs: now) else {
             cancelAutomaticJournalGeneration()
             return
         }
@@ -1407,7 +1407,7 @@ final class AppModel: ObservableObject {
 
         let requestedDay = selectedDay
         let requestedDayString = OpenbirdDateFormatting.dayString(for: requestedDay)
-        let dayRange = Calendar.current.dayRange(for: requestedDay)
+        let dayRange = Calendar.autoupdatingCurrent.dayRange(for: requestedDay)
         lastAutomaticSelectedDayRefreshAt = now
 
         do {
@@ -1435,7 +1435,7 @@ final class AppModel: ObservableObject {
         guard isShuttingDown == false else {
             return
         }
-        guard Calendar.current.isDate(selectedDay, inSameDayAs: Date()) else {
+        guard Calendar.autoupdatingCurrent.isDate(selectedDay, inSameDayAs: Date()) else {
             cancelAutomaticJournalGeneration()
             return
         }
@@ -1472,8 +1472,8 @@ final class AppModel: ObservableObject {
         guard isShuttingDown == false else {
             return
         }
-        guard Calendar.current.isDate(selectedDay, inSameDayAs: requestedDay),
-              Calendar.current.isDate(requestedDay, inSameDayAs: Date()),
+        guard Calendar.autoupdatingCurrent.isDate(selectedDay, inSameDayAs: requestedDay),
+              Calendar.autoupdatingCurrent.isDate(requestedDay, inSameDayAs: Date()),
               let journal = todayJournal
         else {
             return
@@ -1496,7 +1496,7 @@ final class AppModel: ObservableObject {
         pendingAssistantReply = nil
     }
 
-    nonisolated private static func startOfDay(for date: Date, calendar: Calendar = .current) -> Date {
+    nonisolated private static func startOfDay(for date: Date, calendar: Calendar = .autoupdatingCurrent) -> Date {
         calendar.startOfDay(for: date)
     }
 

Sources/OpenbirdApp/TodayView.swift

@@ -361,18 +361,18 @@ struct TodayView: View {
     }
 
     private var selectedDayTitle: String {
-        let day = Calendar.current.component(.day, from: model.selectedDay)
+        let day = Calendar.autoupdatingCurrent.component(.day, from: model.selectedDay)
         let month = Self.selectedDayMonthString(for: model.selectedDay)
         let year = Self.selectedDayYearString(for: model.selectedDay)
         return "\(month) \(day)\(ordinalSuffix(for: day)), \(year)"
     }
 
     private var isShowingToday: Bool {
-        Calendar.current.isDate(model.selectedDay, inSameDayAs: Date())
+        Calendar.autoupdatingCurrent.isDate(model.selectedDay, inSameDayAs: Date())
     }
 
     private func stepSelectedDay(by offset: Int) {
-        let calendar = Calendar.current
+        let calendar = Calendar.autoupdatingCurrent
         let currentDay = calendar.startOfDay(for: model.selectedDay)
         let today = calendar.startOfDay(for: Date())
 

Sources/OpenbirdKit/Storage/OpenbirdStore.swift

@@ -134,7 +134,7 @@ public actor OpenbirdStore {
 
     private func rebuildPreparedActivityEvents(for day: String, date: Date) async throws -> [GroupedActivityEvent] {
         let rawEvents = try database.loadActivityEvents(
-            in: Calendar.current.dayRange(for: date),
+            in: Calendar.autoupdatingCurrent.dayRange(for: date),
             includeExcluded: true
         )
         let groupedEvents = await Task.detached(priority: .utility) {
@@ -231,7 +231,7 @@ public actor OpenbirdStore {
             return []
         }
 
-        let calendar = Calendar.current
+        let calendar = Calendar.autoupdatingCurrent
         let endOfWindow = calendar.startOfDay(for: date)
         guard let startOfWindow = calendar.date(byAdding: .day, value: -(dayCount - 1), to: endOfWindow) else {
             return [OpenbirdDateFormatting.dayString(for: endOfWindow)]
@@ -242,7 +242,7 @@ public actor OpenbirdStore {
 
     private func dayStrings(in range: ClosedRange<Date>) -> Set<String> {
         var dayStrings: Set<String> = []
-        let calendar = Calendar.current
+        let calendar = Calendar.autoupdatingCurrent
         var current = calendar.startOfDay(for: range.lowerBound)
         let last = calendar.startOfDay(for: range.upperBound)
 

Tests/OpenbirdAppTests/AppModelDayRolloverTests.swift

@@ -52,6 +52,23 @@ struct AppModelDayRolloverTests {
         #expect(advancedDay == nil)
     }
 
+    @Test func advancesSelectedDayWhenTimezoneShiftMovesTodayForward() {
+        let losAngeles = makeCalendar(timeZoneID: "America/Los_Angeles")
+        let seoul = makeCalendar(timeZoneID: "Asia/Seoul")
+        let previousCurrentDay = makeDate(year: 2026, month: 4, day: 4, hour: 0, minute: 0, calendar: losAngeles)
+        let selectedDay = previousCurrentDay
+        let now = makeDate(year: 2026, month: 4, day: 5, hour: 9, minute: 0, calendar: seoul)
+
+        let advancedDay = AppModel.autoAdvancedSelectedDay(
+            from: selectedDay,
+            previousCurrentDay: previousCurrentDay,
+            now: now,
+            calendar: seoul
+        )
+
+        #expect(advancedDay == makeDate(year: 2026, month: 4, day: 5, hour: 0, minute: 0, calendar: seoul))
+    }
+
     @Test func returnsOnlyActivityEventsMissingFromJournalCoverage() {
         let calendar = makeCalendar()
         let start = makeDate(year: 2026, month: 3, day: 31, hour: 9, minute: 0, calendar: calendar)
@@ -162,9 +179,9 @@ struct AppModelDayRolloverTests {
         #expect(uncompiled.isEmpty)
     }
 
-    private func makeCalendar() -> Calendar {
+    private func makeCalendar(timeZoneID: String = "UTC") -> Calendar {
         var calendar = Calendar(identifier: .gregorian)
-        calendar.timeZone = TimeZone(secondsFromGMT: 0)!
+        calendar.timeZone = TimeZone(identifier: timeZoneID) ?? TimeZone(secondsFromGMT: 0)!
         return calendar
     }