add missing

client/src/utils/relative-time.ts

@@ -0,0 +1,56 @@
+const relativeTimeFormatter = new Intl.RelativeTimeFormat('en', {
+  numeric: 'auto'
+});
+
+const SECOND = 1;
+const MINUTE = 60 * SECOND;
+const HOUR = 60 * MINUTE;
+const DAY = 24 * HOUR;
+const WEEK = 7 * DAY;
+const MONTH = 30 * DAY;
+const YEAR = 365 * DAY;
+
+interface Threshold {
+  limit: number;
+  divisor: number;
+  unit: Intl.RelativeTimeFormatUnit;
+}
+
+const thresholds: Threshold[] = [
+  { limit: MINUTE, divisor: SECOND, unit: 'second' },
+  { limit: HOUR, divisor: MINUTE, unit: 'minute' },
+  { limit: DAY, divisor: HOUR, unit: 'hour' },
+  { limit: WEEK, divisor: DAY, unit: 'day' },
+  { limit: MONTH, divisor: WEEK, unit: 'week' },
+  { limit: YEAR, divisor: MONTH, unit: 'month' },
+  { limit: Infinity, divisor: YEAR, unit: 'year' }
+];
+
+const parseDateInput = (input: Date | string | number): Date | null => {
+  if (input instanceof Date) {
+    return Number.isNaN(input.getTime()) ? null : input;
+  }
+
+  const parsed = new Date(input);
+  return Number.isNaN(parsed.getTime()) ? null : parsed;
+};
+
+export function formatRelativeTime(input: Date | string | number): string {
+  const targetDate = parseDateInput(input);
+
+  if (!targetDate) {
+    return '';
+  }
+
+  const diffInSeconds = Math.round((targetDate.getTime() - Date.now()) / 1000);
+  const absoluteSeconds = Math.abs(diffInSeconds);
+
+  for (const { limit, divisor, unit } of thresholds) {
+    if (absoluteSeconds < limit) {
+      const value = Math.round(diffInSeconds / divisor);
+      return relativeTimeFormatter.format(value, unit);
+    }
+  }
+
+  return '';
+}