creates application

frontend/src/utils/dateUtils.ts

@@ -0,0 +1,54 @@
+import { format, parseISO, differenceInSeconds, formatDuration as dateFnsFormatDuration } from 'date-fns';
+
+export function formatDate(date: string | Date): string {
+  const d = typeof date === 'string' ? parseISO(date) : date;
+  return format(d, 'MMM d, yyyy');
+}
+
+export function formatTime(date: string | Date): string {
+  const d = typeof date === 'string' ? parseISO(date) : date;
+  return format(d, 'h:mm a');
+}
+
+export function formatDateTime(date: string | Date): string {
+  const d = typeof date === 'string' ? parseISO(date) : date;
+  return format(d, 'MMM d, yyyy h:mm a');
+}
+
+export function formatDuration(totalSeconds: number): string {
+  const hours = Math.floor(totalSeconds / 3600);
+  const minutes = Math.floor((totalSeconds % 3600) / 60);
+  const seconds = totalSeconds % 60;
+
+  const parts = [];
+  if (hours > 0) {
+    parts.push(hours.toString().padStart(2, '0'));
+  }
+  parts.push(minutes.toString().padStart(2, '0'));
+  parts.push(seconds.toString().padStart(2, '0'));
+
+  return parts.join(':');
+}
+
+export function calculateDuration(startTime: string, endTime: string): number {
+  const start = parseISO(startTime);
+  const end = parseISO(endTime);
+  return differenceInSeconds(end, start);
+}
+
+export function formatDurationFromDates(startTime: string, endTime: string): string {
+  const seconds = calculateDuration(startTime, endTime);
+  return formatDuration(seconds);
+}
+
+export function getLocalISOString(date: Date = new Date()): string {
+  const timezoneOffset = date.getTimezoneOffset() * 60000;
+  const localISOTime = new Date(date.getTime() - timezoneOffset).toISOString().slice(0, 16);
+  return localISOTime;
+}
+
+export function toISOTimezone(dateStr: string): string {
+  // Convert a local datetime input to ISO string with timezone
+  const date = new Date(dateStr);
+  return date.toISOString();
+}