fix: Outlook UTC date parsing and event deduplication

- Outlook returns dateTime without Z suffix despite timeZone being UTC,
  causing JS to parse as local time (1h shift). Now appends Z for UTC dates.
- Added frontend deduplication to prevent stacked rendering of duplicate events.
- Added Outlook event debug logging for recurring event investigation.

v1.62.3

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "my-weekly-todo-list",
-  "version": "1.62.2",
+  "version": "1.62.3",
   "description": "A web-based weekly task management application that organizes to-dos and calendar events in a single, intuitive weekly view",
   "main": "index.js",
   "scripts": {

src/components/WeeklyView.tsx

@@ -1607,9 +1607,14 @@ export default function WeeklyView() {
     type WeatherHour = { temp: number; code: number; feelsLike?: number; wind?: number; gusts?: number; precipProb?: number; precip?: number; humidity?: number; uv?: number };
     const [weatherData, setWeatherData] = useState<Record<string, WeatherHour>>({});
 
-    // Extend events with editable flag from connections
+    // Extend events with editable flag from connections, deduplicate by id
     const calendarEvents = useMemo(() => {
-        return rawCalendarEvents.map((event) => {
+        const seen = new Set<string>();
+        return rawCalendarEvents.filter((event) => {
+            if (seen.has(event.id)) return false;
+            seen.add(event.id);
+            return true;
+        }).map((event) => {
             let isEditable = false;
             if (event.calendarId) {
                 for (const conn of connections) {

src/lib/calendar-events.ts

@@ -620,6 +620,8 @@ export const getCalendarEvents = async (
 
               const calendarData = calendars.find(c => c.id === calendarId);
 
+              console.log(`[CALENDAR] Outlook calendar ${calendarId}: ${outlookEvents.length} events`, outlookEvents.map((e: any) => ({ id: e.id?.slice(-10), title: e.summary, start: e.start?.dateTime?.slice(0, 16), recurring: e.isRecurring })));
+
               events = events.concat(outlookEvents.map((event: any) => ({
                 id: event.id,
                 title: event.summary || '(No Title)',

src/lib/outlook-calendar.ts

@@ -212,16 +212,21 @@ export const getUpcomingEvents = async (
             'normal': 'default', 'personal': 'default', 'private': 'private', 'confidential': 'confidential',
         };
 
+        // Outlook returns dateTime without Z suffix even when timeZone is UTC.
+        // Append Z so JS Date parsing treats it as UTC (not local time).
+        const fixUtc = (dt: string, tz: string) =>
+            dt && tz === 'UTC' && !dt.endsWith('Z') ? dt + 'Z' : dt;
+
         return {
             id: event.seriesMasterId ? `${event.seriesMasterId}::${event.id}` : event.id,
             summary: event.subject,
             description: event.body?.content || event.bodyPreview,
             start: {
-                dateTime: event.start.dateTime,
+                dateTime: fixUtc(event.start.dateTime, event.start.timeZone),
                 timeZone: event.start.timeZone
             },
             end: {
-                dateTime: event.end.dateTime,
+                dateTime: fixUtc(event.end.dateTime, event.end.timeZone),
                 timeZone: event.end.timeZone
             },
             location: event.location?.displayName,