Handling of all day events and auto calendar sync on account creation.

Wino.Core/Extensions/GoogleIntegratorExtensions.cs

@@ -180,6 +180,31 @@ public static class GoogleIntegratorExtensions
         return null;
     }
 
+    public static DateTime? GetEventLocalDateTime(EventDateTime calendarEvent)
+    {
+        if (calendarEvent == null)
+        {
+            return null;
+        }
+
+        if (calendarEvent.DateTimeDateTimeOffset != null)
+        {
+            return DateTime.SpecifyKind(calendarEvent.DateTimeDateTimeOffset.Value.DateTime, DateTimeKind.Unspecified);
+        }
+
+        if (calendarEvent.Date != null)
+        {
+            if (DateTime.TryParse(calendarEvent.Date, out DateTime eventDateTime))
+            {
+                return DateTime.SpecifyKind(eventDateTime, DateTimeKind.Unspecified);
+            }
+
+            throw new Exception("Invalid date format in Google Calendar event date.");
+        }
+
+        return null;
+    }
+
     /// <summary>
     /// Extracts the timezone string from EventDateTime.
     /// Returns null for all-day events or if timezone is not specified.

Wino.Core/Extensions/OutlookIntegratorExtensions.cs

@@ -335,6 +335,21 @@ public static class OutlookIntegratorExtensions
         }
     }
 
+    public static DateTime GetLocalDateTimeFromDateTimeTimeZone(DateTimeTimeZone dateTimeTimeZone)
+    {
+        if (dateTimeTimeZone == null || string.IsNullOrEmpty(dateTimeTimeZone.DateTime))
+        {
+            throw new ArgumentException("DateTimeTimeZone or DateTime is null or empty.");
+        }
+
+        if (!DateTime.TryParse(dateTimeTimeZone.DateTime, out DateTime parsedDateTime))
+        {
+            throw new ArgumentException("DateTime string is not in a valid format.");
+        }
+
+        return DateTime.SpecifyKind(parsedDateTime, DateTimeKind.Unspecified);
+    }
+
     private static AttendeeStatus GetAttendeeStatus(ResponseType? responseType)
     {
         return responseType switch

Wino.Core/Integration/Processors/GmailChangeProcessor.cs

@@ -66,12 +66,14 @@ public class GmailChangeProcessor : DefaultChangeProcessor, IGmailChangeProcesso
             // We don't have this event yet. Create a new one.
             var eventStartDateTimeOffset = GoogleIntegratorExtensions.GetEventDateTimeOffset(calendarEvent.Start);
             var eventEndDateTimeOffset = GoogleIntegratorExtensions.GetEventDateTimeOffset(calendarEvent.End);
+            var eventStartLocalDateTime = GoogleIntegratorExtensions.GetEventLocalDateTime(calendarEvent.Start);
+            var eventEndLocalDateTime = GoogleIntegratorExtensions.GetEventLocalDateTime(calendarEvent.End);
 
             double totalDurationInSeconds = 0;
 
-            if (eventStartDateTimeOffset != null && eventEndDateTimeOffset != null)
+            if (eventStartLocalDateTime != null && eventEndLocalDateTime != null)
             {
-                totalDurationInSeconds = (eventEndDateTimeOffset.Value - eventStartDateTimeOffset.Value).TotalSeconds;
+                totalDurationInSeconds = (eventEndLocalDateTime.Value - eventStartLocalDateTime.Value).TotalSeconds;
             }
 
             CalendarItem calendarItem = null;
@@ -97,7 +99,7 @@ public class GmailChangeProcessor : DefaultChangeProcessor, IGmailChangeProcesso
                     CreatedAt = DateTimeOffset.UtcNow,
                     Description = calendarEvent.Description ?? parentRecurringEvent.Description,
                     Id = Guid.NewGuid(),
-                    StartDate = eventStartDateTimeOffset.Value.UtcDateTime,
+                    StartDate = eventStartLocalDateTime.Value,
                     DurationInSeconds = totalDurationInSeconds,
                     Location = string.IsNullOrEmpty(calendarEvent.Location) ? parentRecurringEvent.Location : calendarEvent.Location,
 
@@ -136,7 +138,7 @@ public class GmailChangeProcessor : DefaultChangeProcessor, IGmailChangeProcesso
                     CreatedAt = DateTimeOffset.UtcNow,
                     Description = calendarEvent.Description,
                     Id = Guid.NewGuid(),
-                    StartDate = eventStartDateTimeOffset.Value.UtcDateTime,
+                    StartDate = eventStartLocalDateTime.Value,
                     DurationInSeconds = totalDurationInSeconds,
                     Location = calendarEvent.Location,
 

Wino.Core/Integration/Processors/OutlookChangeProcessor.cs

@@ -59,14 +59,15 @@ public class OutlookChangeProcessor(IDatabaseService databaseService,
             savingItem = new CalendarItem() { Id = savingItemId };
         }
 
-        DateTimeOffset eventStartDateTimeOffset = OutlookIntegratorExtensions.GetDateTimeOffsetFromDateTimeTimeZone(calendarEvent.Start);
-        DateTimeOffset eventEndDateTimeOffset = OutlookIntegratorExtensions.GetDateTimeOffsetFromDateTimeTimeZone(calendarEvent.End);
+        var eventStartLocalDateTime = OutlookIntegratorExtensions.GetLocalDateTimeFromDateTimeTimeZone(calendarEvent.Start);
+        var eventEndLocalDateTime = OutlookIntegratorExtensions.GetLocalDateTimeFromDateTimeTimeZone(calendarEvent.End);
 
-        var durationInSeconds = (eventEndDateTimeOffset - eventStartDateTimeOffset).TotalSeconds;
+        var durationInSeconds = (eventEndLocalDateTime - eventStartLocalDateTime).TotalSeconds;
 
-        // Store dates as UTC in the database
+        // Store the wall-clock values exactly as Outlook returned them for the event timezone.
+        // Timed events are converted for display later, while all-day events stay as floating dates.
         savingItem.RemoteEventId = calendarEvent.Id.WithClientTrackingId(calendarEvent.TransactionId.GetClientTrackingId());
-        savingItem.StartDate = eventStartDateTimeOffset.UtcDateTime;
+        savingItem.StartDate = eventStartLocalDateTime;
         savingItem.DurationInSeconds = durationInSeconds;
 
         // Store the timezone information from the event