calculations

backend/workerRoutes.js

@@ -95,12 +95,13 @@ export default function(db) {
 
   router.use(authenticateJWT);
 // Definitive version with distance calculation and specific error messages
+router.post('/clock', async (req, res) => {
+  try {
+    const { userId, eventType, qrCodeValue, latitude, longitude, device_epoch_ms } = req.body;
 
-// Definitive version with distance calculation and specific error messages
-  router.post('/clock', async (req, res) => {
-    try {
-      const { userId, eventType, qrCodeValue, latitude, longitude } = req.body;
-      const currentTimestamp = new Date().toISOString().slice(0, 19).replace('T', ' ');
+    // Use the device's recorded instant if provided; fall back to server time.
+    const ts = Number.isFinite(+device_epoch_ms) ? new Date(Number(device_epoch_ms)) : new Date();
+    const currentTimestamp = ts.toISOString().slice(0, 19).replace('T', ' ');
 
       // 1. Kill Switch Enforcement
       const clockingAllowed = await isClockingEnabled(db);

src/views/WorkerDashboard.vue

@@ -186,13 +186,29 @@ const fetchCurrentStatus = async () => {
   }
 }
 
+const getTimeContext = () => {
+  const tzName = Intl.DateTimeFormat().resolvedOptions().timeZone || 'UTC'
+  const offsetMin = -new Date().getTimezoneOffset() // east of UTC => positive
+  return { device_epoch_ms: Date.now(), tz_name: tzName, offset_min: offsetMin }
+}
+
 const sendClockEvent = async (qrCodeValue, latitude, longitude) => {
   const eventType = isClockedIn.value ? 'clock_out' : 'clock_in'
   try {
+    const payload = {
+      userId,
+      eventType,
+      qrCodeValue,
+      latitude,
+      longitude,
+      ...getTimeContext() // new: device_epoch_ms, tz_name, offset_min
+    }
+
     await apiFetch('/api/clock', {
       method: 'POST',
-      body: JSON.stringify({ userId, eventType, qrCodeValue, latitude, longitude }),
+      body: JSON.stringify(payload),
     });
+
     const newClockStatus = !isClockedIn.value
     isClockedIn.value = newClockStatus
     triggerOverlay(t(newClockStatus ? 'successClockIn' : 'successClockOut'), 'success');