notifications: timezone fix + configurable site timezone

plugins/notifications/frontend/views/CalendarView.vue

@@ -231,13 +231,17 @@ function openEventFromTooltip(evt) {
 
 function formatDate(dateStr) {
   if (!dateStr) return ''
-  return new Date(dateStr).toLocaleDateString('en-US', {
+  // allDay events carry a site-local date-only value (YYYY-MM-DD). Build the
+  // Date from local parts so it is not shifted a day by UTC-midnight parsing.
+  const parts = /^(\d{4})-(\d{2})-(\d{2})$/.exec(dateStr)
+  const date = parts
+    ? new Date(Number(parts[1]), Number(parts[2]) - 1, Number(parts[3]))
+    : new Date(dateStr)
+  return date.toLocaleDateString('en-US', {
     weekday: 'short',
     year: 'numeric',
     month: 'short',
-    day: 'numeric',
-    hour: '2-digit',
-    minute: '2-digit'
+    day: 'numeric'
   })
 }
 </script>