refactor: add date utility for consistent UTC handling

src/routes/arr/[id]/upgrades/components/CooldownTracker.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
 	import { onMount, onDestroy } from 'svelte';
 	import { Clock, Timer, CheckCircle, PauseCircle } from 'lucide-svelte';
+	import { parseUTC } from '$shared/dates';
 
 	export let enabled: boolean;
 	export let schedule: number; // minutes
@@ -20,8 +21,7 @@
 	});
 
 	// Calculate times
-	// Database stores timestamps without timezone - append Z to parse as UTC
-	$: lastRunTime = lastRunAt ? new Date(lastRunAt.endsWith('Z') ? lastRunAt : lastRunAt + 'Z').getTime() : null;
+	$: lastRunTime = parseUTC(lastRunAt)?.getTime() ?? null;
 	$: scheduleMs = schedule * 60 * 1000;
 	$: nextRunTime = lastRunTime ? lastRunTime + scheduleMs : null;
 	$: timeUntilNext = nextRunTime ? nextRunTime - now : null;
@@ -49,14 +49,10 @@
 		return `${seconds}s`;
 	}
 
-	// Parse timestamp - append Z if needed to treat as UTC
-	function parseTimestamp(str: string): Date {
-		return new Date(str.endsWith('Z') ? str : str + 'Z');
-	}
-
 	// Format absolute time
 	function formatTime(isoString: string): string {
-		const date = parseTimestamp(isoString);
+		const date = parseUTC(isoString);
+		if (!date) return '-';
 		return date.toLocaleTimeString('en-US', {
 			hour: 'numeric',
 			minute: '2-digit',
@@ -65,7 +61,8 @@
 	}
 
 	function formatDate(isoString: string): string {
-		const date = parseTimestamp(isoString);
+		const date = parseUTC(isoString);
+		if (!date) return '-';
 		const today = new Date();
 		const yesterday = new Date(today);
 		yesterday.setDate(yesterday.getDate() - 1);

src/routes/databases/+page.svelte

@@ -13,6 +13,7 @@
 	import SearchAction from '$ui/actions/SearchAction.svelte';
 	import { createSearchStore } from '$stores/search';
 	import { alertStore } from '$alerts/store';
+	import { parseUTC } from '$shared/dates';
 	import type { PageData } from './$types';
 	import type { Column } from '$ui/table/types';
 	import type { DatabaseInstance } from '$db/queries/databaseInstances.ts';
@@ -66,8 +67,14 @@
 
 	// Format last synced date
 	function formatLastSynced(date: string | null): string {
-		if (!date) return 'Never';
-		return new Date(date).toLocaleDateString();
+		const d = parseUTC(date);
+		if (!d) return 'Never';
+		return d.toLocaleString(undefined, {
+			month: 'short',
+			day: 'numeric',
+			hour: 'numeric',
+			minute: '2-digit'
+		});
 	}
 
 	// Handle row click - navigate to database details

src/routes/delay-profiles/[databaseId]/views/TableView.svelte

@@ -5,12 +5,13 @@
 	import { Tag, Clock, Zap, Shield, Calendar } from 'lucide-svelte';
 	import { goto } from '$app/navigation';
 	import { page } from '$app/stores';
+	import { parseUTC } from '$shared/dates';
 
 	export let profiles: DelayProfileTableRow[];
 
 	function formatDate(dateString: string): string {
-		// SQLite stores timestamps without timezone info, treat as UTC
-		const date = new Date(dateString + 'Z');
+		const date = parseUTC(dateString);
+		if (!date) return '-';
 		return date.toLocaleString(undefined, {
 			year: 'numeric',
 			month: 'short',

src/routes/regular-expressions/[databaseId]/views/TableView.svelte

@@ -6,12 +6,13 @@
 	import { marked } from 'marked';
 	import { goto } from '$app/navigation';
 	import { page } from '$app/stores';
+	import { parseUTC } from '$shared/dates';
 
 	export let expressions: RegularExpressionTableRow[];
 
 	function formatDate(dateString: string): string {
-		// SQLite stores timestamps without timezone info, treat as UTC
-		const date = new Date(dateString + 'Z');
+		const date = parseUTC(dateString);
+		if (!date) return '-';
 		return date.toLocaleString(undefined, {
 			year: 'numeric',
 			month: 'short',

src/routes/settings/notifications/components/NotificationHistory.svelte

@@ -1,14 +1,14 @@
 <script lang="ts">
 	import { Bell } from 'lucide-svelte';
+	import { parseUTC } from '$shared/dates';
 	import type { NotificationHistoryRecord } from '$db/queries/notificationHistory.ts';
 
 	export let history: NotificationHistoryRecord[];
 	export let services: Array<{ id: string; name: string }>;
 
 	function formatDateTime(date: string): string {
-		// SQLite stores as UTC without timezone indicator, append Z to parse correctly
-		const utcDate = date.endsWith('Z') ? date : date.replace(' ', 'T') + 'Z';
-		return new Date(utcDate).toLocaleString();
+		const d = parseUTC(date);
+		return d ? d.toLocaleString() : '-';
 	}
 
 	function getServiceName(serviceId: string): string {