fix:SQLite missing timezone 'fix'

frontend/src/components/assessment/ActivityHistoryModal.vue

@@ -19,6 +19,7 @@ import {
 } from '@/components/ui/select';
 import { activityService } from '@/services/activityService';
 import type { ActivityHistoryRead, ActivityRead } from '@/types/utils';
+import { parseServerDate } from '@/utils/dateFormatter';
 
 const props = defineProps<{
     open: boolean;
@@ -98,7 +99,7 @@ watch(selectedVersionId, (newId) => {
 
 const formatDate = (dateString: string) => {
     try {
-        const d = new Date(dateString);
+        const d = parseServerDate(dateString);
         return (
             d.toLocaleDateString() +
             ' ' +

frontend/src/components/ui/DateTimePicker.vue

@@ -23,7 +23,7 @@ import {
   SelectValue,
 } from '@/components/ui/select';
 import { usePreferencesStore } from '@/stores/preferences';
-import { formatDateTime, formatDateTimeEditable, parseDateTimeInput } from '@/utils/dateFormatter';
+import { formatDateTime, formatDateTimeEditable, parseDateTimeInput, parseServerDate } from '@/utils/dateFormatter';
 
 const props = defineProps<{
   modelValue: string | null | undefined;
@@ -42,7 +42,7 @@ const timeValue = ref<string>('00:00'); // Always HH:mm 24h format for internal
 
 // Helper: Parse UTC string to components in target timezone
 function parseToTimezone(utcIsoString: string, timezone?: string) {
-    const date = new Date(utcIsoString);
+    const date = parseServerDate(utcIsoString);
     if (isNaN(date.getTime())) return null;
 
     const opts: Intl.DateTimeFormatOptions = {

frontend/src/composables/useActivityEvaluation.ts

@@ -1,6 +1,7 @@
 import type { Ref } from 'vue';
 import { computed, watch } from 'vue';
 import type { ActivityEvaluationUpdate, ActivityRead } from '@/types/utils';
+import { parseServerDate } from '@/utils/dateFormatter';
 
 export type EvalResult = 'PASS' | 'FAIL' | 'N/A';
 
@@ -9,8 +10,8 @@ export function formatTimeDiff(
     toTime: string | Date | null | undefined,
 ): string {
     if (!fromTime || !toTime) return '';
-    const from = new Date(fromTime).getTime();
-    const to = new Date(toTime).getTime();
+    const from = parseServerDate(fromTime).getTime();
+    const to = parseServerDate(toTime).getTime();
     if (Number.isNaN(from) || Number.isNaN(to)) return '';
     const diffMs = to - from;
     if (diffMs < 0) return 'N/A (negative)';

frontend/src/utils/dateFormatter.ts

@@ -7,6 +7,16 @@ export interface FormatOptions {
     timeFormat?: TimeFormat;
 }
 
+// Server timestamps without an explicit offset (e.g. SQLite-backed responses)
+// must be treated as UTC. JS's Date constructor would otherwise parse them as
+// local time. Postgres responses include a "Z" suffix and are passed through.
+const HAS_TZ_SUFFIX = /[zZ]|[+-]\d{2}:?\d{2}$/;
+
+export function parseServerDate(value: string | Date): Date {
+    if (value instanceof Date) return value;
+    return new Date(HAS_TZ_SUFFIX.test(value) ? value : `${value}Z`);
+}
+
 export function formatDateTime(
     dateString: string | null | undefined,
     timezone?: string,
@@ -15,7 +25,7 @@ export function formatDateTime(
 ): string {
     if (!dateString) return '-';
 
-    const date = new Date(dateString);
+    const date = parseServerDate(dateString);
     if (Number.isNaN(date.getTime())) return 'Invalid Date';
 
     const hour12 = timeFormat === 'browser' ? undefined : timeFormat === '12h';
@@ -150,7 +160,7 @@ export function formatDateTimeEditable(
     timeFormat: TimeFormat = 'browser',
 ): string {
     if (!dateString) return '';
-    const date = new Date(dateString);
+    const date = parseServerDate(dateString);
     if (Number.isNaN(date.getTime())) return '';
 
     const hour12 = timeFormat === 'browser' ? undefined : timeFormat === '12h';