Update dependencies and enhance UptimeStatusIsland component with timezone and locale handling

- Added luxon library for improved date handling.
- Updated UptimeStatusIsland component to format and display local time for heartbeats.
- Enhanced state management to track user timezone and locale.
- Ensured UTC formatting for timestamps in API responses.

src/pages/api/uptime.ts

@@ -7,7 +7,7 @@ const STATUS_PAGE_SLUG = '365devnet'; // all lowercase
 
 interface Heartbeat {
   status: number; // 0=DOWN, 1=UP, 2=PENDING, 3=MAINTENANCE
-  time: string;
+  time: string; // UTC ISO string
   msg: string;
   ping: number | null;
   important?: boolean;
@@ -28,7 +28,7 @@ interface Monitor {
   uptimePercent?: number;
   currentPing?: number;
   avgPing?: number;
-  lastChecked?: string;
+  lastChecked?: string; // UTC ISO string
   uptime24h?: number;
 }
 
@@ -56,6 +56,12 @@ const fetchWithTimeout = async (url: string, options: RequestInit, timeout = 100
   }
 };
 
+// Helper function to ensure a date string is in UTC ISO format
+function ensureUTC(dateString: string): string {
+  const date = new Date(dateString);
+  return date.toISOString();
+}
+
 export const GET: APIRoute = async () => {
   try {
     if (!UPTIME_KUMA_URL) {
@@ -107,7 +113,11 @@ export const GET: APIRoute = async () => {
       for (const group of data.publicGroupList) {
         for (const monitor of group.monitorList) {
           const hbArr = heartbeatList[monitor.id.toString()] || [];
-          monitor.heartbeatHistory = hbArr;
+          // Ensure all heartbeat times are in UTC
+          monitor.heartbeatHistory = hbArr.map(hb => ({
+            ...hb,
+            time: ensureUTC(hb.time)
+          }));
           // Uptime % (last 40 heartbeats)
           if (hbArr.length > 0) {
             const last40 = hbArr.slice(-40);
@@ -118,8 +128,8 @@ export const GET: APIRoute = async () => {
             // Average ping (last 40 heartbeats)
             const pings = last40.map(hb => hb.ping).filter(p => typeof p === 'number') as number[];
             monitor.avgPing = pings.length > 0 ? Math.round((pings.reduce((a, b) => a + b, 0) / pings.length) * 10) / 10 : undefined;
-            // Last checked
-            monitor.lastChecked = last40[last40.length - 1]?.time ?? undefined;
+            // Last checked (ensure UTC)
+            monitor.lastChecked = last40[last40.length - 1]?.time ? ensureUTC(last40[last40.length - 1].time) : undefined;
           } else {
             monitor.uptimePercent = undefined;
             monitor.currentPing = undefined;