fix(web): album date range formatting

web/src/lib/components/album-page/AlbumSummary.svelte

@@ -3,15 +3,18 @@
   import type { AlbumResponseDto } from '@immich/sdk';
   import { t } from 'svelte-i18n';
 
-  interface Props {
+  type Props = {
     album: AlbumResponseDto;
-  }
+  };
 
-  let { album }: Props = $props();
+  const { album }: Props = $props();
+  const startDate = album.startDate;
 </script>
 
 <span class="my-2 flex gap-2 text-sm font-medium text-gray-500" data-testid="album-details">
-  <span>{getAlbumDateRange(album)}</span>
-  <span>•</span>
+  {#if startDate}
+    <span>{getAlbumDateRange(startDate, album.endDate ?? startDate)}</span>
+    <span>•</span>
+  {/if}
   <span>{$t('items_count', { values: { count: album.assetCount } })}</span>
 </span>

web/src/lib/constants.ts

@@ -34,6 +34,12 @@ export const dateFormats = {
     month: 'short',
     day: 'numeric',
     year: 'numeric',
+    timeZone: 'UTC',
+  } satisfies Intl.DateTimeFormatOptions,
+  albumShort: {
+    month: 'short',
+    year: 'numeric',
+    timeZone: 'UTC',
   } satisfies Intl.DateTimeFormatOptions,
   settings: {
     month: 'short',

web/src/lib/utils/date-time.spec.ts

@@ -1,66 +1,93 @@
 import { writable } from 'svelte/store';
+import { locale } from '$lib/stores/preferences.store';
 import { getAlbumDateRange, getShortDateRange } from './date-time';
 
+vitest.mock('$lib/stores/preferences.store', () => ({
+  locale: writable('en'),
+}));
+
 describe('getShortDateRange', () => {
   beforeEach(() => {
     vi.stubEnv('TZ', 'UTC');
+    locale.set('en');
+  });
+
+  afterAll(() => {
+    vi.unstubAllEnvs();
+    locale.set('en');
+  });
+
+  it('should correctly return long month if start and end date are within the same month', () => {
+    expect(getShortDateRange('2022-01-01T00:00:00.000Z', '2022-01-31T00:00:00.000Z')).toEqual('January 2022');
+  });
+
+  it('should correctly return month range if start and end date are in separate months within the same year', () => {
+    expect(getShortDateRange('2022-01-01T00:00:00.000Z', '2022-02-01T00:00:00.000Z')).toEqual('Jan – Feb 2022');
+  });
+
+  it('should correctly return range if start and end date are in separate months and years', () => {
+    expect(getShortDateRange('2021-12-01T00:00:00.000Z', '2022-01-01T00:00:00.000Z')).toEqual('Dec 2021 – Jan 2022');
+  });
+
+  it('should correctly return long month if start and end date are within the same month, ignoring local time zone', () => {
+    vi.stubEnv('TZ', 'UTC+6');
+    expect(getShortDateRange('2022-01-01T00:00:00.000Z', '2022-01-31T00:00:00.000Z')).toEqual('January 2022');
+  });
+
+  it('should correctly return month range if start and end date are in separate months within the same year, ignoring local time zone', () => {
+    vi.stubEnv('TZ', 'UTC+6');
+    expect(getShortDateRange('2022-01-01T00:00:00.000Z', '2022-02-01T00:00:00.000Z')).toEqual('Jan – Feb 2022');
+  });
+
+  it('should correctly return range if start and end date are in separate months and years, ignoring local time zone', () => {
+    vi.stubEnv('TZ', 'UTC+6');
+    expect(getShortDateRange('2021-12-01T00:00:00.000Z', '2022-01-01T00:00:00.000Z')).toEqual('Dec 2021 – Jan 2022');
+  });
+
+  it('should correctly return range if start and end date are in separate months and years, ignoring local time zone', () => {
+    vi.stubEnv('TZ', 'UTC-6');
+    expect(getShortDateRange('2021-12-01T00:00:00.000Z', '2022-01-01T00:00:00.000Z')).toEqual('Dec 2021 – Jan 2022');
+  });
+
+  it('should use the correct locale to return month range', () => {
+    locale.set('fr');
+    expect(getShortDateRange('2022-01-01T00:00:00.000Z', '2022-02-01T00:00:00.000Z')).toEqual('janv.–févr. 2022');
+  });
+
+  it('should use the correct locale to return month-year range', () => {
+    locale.set('fr');
+    expect(getShortDateRange('2021-12-01T00:00:00.000Z', '2022-01-01T00:00:00.000Z')).toEqual('déc. 2021 – janv. 2022');
+  });
+});
+
+describe('getAlbumDateRange', () => {
+  beforeAll(() => {
+    vi.stubEnv('TZ', 'UTC');
   });
 
   afterAll(() => {
     vi.unstubAllEnvs();
   });
 
-  it('should correctly return month if start and end date are within the same month', () => {
-    expect(getShortDateRange('2022-01-01T00:00:00.000Z', '2022-01-31T00:00:00.000Z')).toEqual('Jan 2022');
+  it('should work', () => {
+    expect(getAlbumDateRange('2021-01-01T00:00:00Z', '2021-01-05T00:00:00Z')).toEqual('Jan 1 – 5, 2021');
   });
 
-  it('should correctly return month range if start and end date are in separate months within the same year', () => {
-    expect(getShortDateRange('2022-01-01T00:00:00.000Z', '2022-02-01T00:00:00.000Z')).toEqual('Jan - Feb 2022');
+  it('should work with a single day range', () => {
+    expect(getAlbumDateRange('2021-01-01T09:00:00Z', '2021-01-01T10:00:00Z')).toEqual('Jan 1, 2021');
   });
 
-  it('should correctly return range if start and end date are in separate months and years', () => {
-    expect(getShortDateRange('2021-12-01T00:00:00.000Z', '2022-01-01T00:00:00.000Z')).toEqual('Dec 2021 - Jan 2022');
+  it('should work with positive time zone present', () => {
+    expect(getAlbumDateRange('2021-01-01T00:00:00+05:00', '2021-01-01T00:00:00+05:00')).toEqual('Jan 1, 2021');
   });
 
-  it('should correctly return month if start and end date are within the same month, ignoring local time zone', () => {
-    vi.stubEnv('TZ', 'UTC+6');
-    expect(getShortDateRange('2022-01-01T00:00:00.000Z', '2022-01-31T00:00:00.000Z')).toEqual('Jan 2022');
+  it('should work with negative time zone present', () => {
+    expect(getAlbumDateRange('2021-01-01T00:00:00-05:00', '2021-01-01T00:00:00-05:00')).toEqual('Jan 1, 2021');
   });
 
-  it('should correctly return month range if start and end date are in separate months within the same year, ignoring local time zone', () => {
-    vi.stubEnv('TZ', 'UTC+6');
-    expect(getShortDateRange('2022-01-01T00:00:00.000Z', '2022-02-01T00:00:00.000Z')).toEqual('Jan - Feb 2022');
-  });
-
-  it('should correctly return range if start and end date are in separate months and years, ignoring local time zone', () => {
-    vi.stubEnv('TZ', 'UTC+6');
-    expect(getShortDateRange('2021-12-01T00:00:00.000Z', '2022-01-01T00:00:00.000Z')).toEqual('Dec 2021 - Jan 2022');
-  });
-});
-
-describe('getAlbumDate', () => {
-  beforeAll(() => {
-    process.env.TZ = 'UTC';
-
-    vitest.mock('$lib/stores/preferences.store', () => ({
-      locale: writable('en'),
-    }));
-  });
-
-  it('should work with only a start date', () => {
-    expect(getAlbumDateRange({ startDate: '2021-01-01T00:00:00Z' })).toEqual('Jan 1, 2021');
-  });
-
-  it('should work with a start and end date', () => {
-    expect(
-      getAlbumDateRange({
-        startDate: '2021-01-01T00:00:00Z',
-        endDate: '2021-01-05T00:00:00Z',
-      }),
-    ).toEqual('Jan 1, 2021 - Jan 5, 2021');
-  });
-
-  it('should work with the new date format', () => {
-    expect(getAlbumDateRange({ startDate: '2021-01-01T00:00:00+05:00' })).toEqual('Jan 1, 2021');
+  it('should use the proper locale', () => {
+    locale.set('fr');
+    expect(getAlbumDateRange('2020-03-26T12:00:00Z', '2021-12-01T00:00:00Z')).toEqual('26 mars 2020 – 1 déc. 2021');
+    locale.set('en');
   });
 });

web/src/lib/utils/date-time.ts

@@ -7,69 +7,28 @@ export function parseUtcDate(date: string) {
   return DateTime.fromISO(date, { zone: 'UTC' }).toUTC();
 }
 
-export const getShortDateRange = (startTimestamp: string, endTimestamp: string) => {
+const getDateRange = (startTimestamp: string, endTimestamp: string, format: 'short' | 'long') => {
   const userLocale = get(locale);
-  let startDate = DateTime.fromISO(startTimestamp).setZone('UTC');
-  let endDate = DateTime.fromISO(endTimestamp).setZone('UTC');
+  const startDate = DateTime.fromISO(startTimestamp).setZone('UTC');
+  const endDate = DateTime.fromISO(endTimestamp).setZone('UTC').setLocale(userLocale);
 
-  if (userLocale) {
-    startDate = startDate.setLocale(userLocale);
-    endDate = endDate.setLocale(userLocale);
+  if (startDate.year === endDate.year && startDate.month === endDate.month && format === 'short') {
+    return endDate.toLocaleString({ month: 'long', year: 'numeric' });
   }
 
-  const endDateLocalized = endDate.toLocaleString({
-    month: 'short',
-    year: 'numeric',
-  });
-
-  if (startDate.year === endDate.year) {
-    if (startDate.month === endDate.month) {
-      // Same year and month.
-      // e.g.: aug. 2024
-      return endDateLocalized;
-    } else {
-      // Same year but different month.
-      // e.g.: jul. - sept. 2024
-      const startMonthLocalized = startDate.toLocaleString({
-        month: 'short',
-      });
-      return `${startMonthLocalized} - ${endDateLocalized}`;
-    }
-  } else {
-    // Different year.
-    // e.g.: feb. 2021 - sept. 2024
-    const startDateLocalized = startDate.toLocaleString({
-      month: 'short',
-      year: 'numeric',
-    });
-    return `${startDateLocalized} - ${endDateLocalized}`;
-  }
+  const formatter = new Intl.DateTimeFormat(
+    userLocale,
+    format === 'short' ? dateFormats.albumShort : dateFormats.album,
+  );
+  return formatter.formatRange(startDate.toJSDate(), endDate.toJSDate());
 };
 
-const formatDate = (date?: string) => {
-  if (!date) {
-    return;
-  }
+/**
+ * Get localized date range in short format like 'Oct – Nov 2026', with full month if start and end are the same: 'October 2026'
+ */
+export const getShortDateRange = (start: string, end: string) => getDateRange(start, end, 'short');
 
-  // without timezone
-  const localDate = date.replace(/Z$/, '').replace(/\+.+$/, '');
-  return localDate ? new Date(localDate).toLocaleDateString(get(locale), dateFormats.album) : undefined;
-};
-
-export const getAlbumDateRange = (album: { startDate?: string; endDate?: string }) => {
-  const start = formatDate(album.startDate);
-  const end = formatDate(album.endDate);
-
-  if (start && end && start !== end) {
-    return `${start} - ${end}`;
-  }
-
-  if (start) {
-    return start;
-  }
-
-  return '';
-};
+export const getAlbumDateRange = (start: string, end: string) => getDateRange(start, end, 'long');
 
 /**
  * Use this to convert from "5pm EST" to "5pm UTC"