fix(server): respect timezone in iso date string encoding

server/src/dtos/album.dto.ts

@@ -6,7 +6,7 @@ import { MapAsset } from 'src/dtos/asset-response.dto';
 import { UserResponseSchema, mapUser } from 'src/dtos/user.dto';
 import { AlbumUserRole, AlbumUserRoleSchema, AssetOrder, AssetOrderSchema } from 'src/enum';
 import { MaybeDehydrated } from 'src/types';
-import { asDateString } from 'src/utils/date';
+import { asDateTimeString } from 'src/utils/date';
 import { stringToBool } from 'src/validation';
 import z from 'zod';
 
@@ -195,14 +195,14 @@ export const mapAlbum = (entity: MaybeDehydrated<MapAlbumDto>): AlbumResponseDto
     albumName: entity.albumName,
     description: entity.description,
     albumThumbnailAssetId: entity.albumThumbnailAssetId,
-    createdAt: asDateString(entity.createdAt),
+    createdAt: asDateTimeString(entity.createdAt),
-    updatedAt: asDateString(entity.updatedAt),
+    updatedAt: asDateTimeString(entity.updatedAt),
     id: entity.id,
     albumUsers,
     shared: hasSharedUser || hasSharedLink,
     hasSharedLink,
-    startDate: asDateString(startDate),
+    startDate: asDateTimeString(startDate),
-    endDate: asDateString(endDate),
+    endDate: asDateTimeString(endDate),
     assetCount: entity.assets?.length || 0,
     isActivityEnabled: entity.isActivityEnabled,
     order: entity.order,

server/src/dtos/asset-response.dto.ts

@@ -18,7 +18,7 @@ import {
 } from 'src/enum';
 import { MaybeDehydrated } from 'src/types';
 import { hexOrBufferToBase64 } from 'src/utils/bytes';
-import { asDateString } from 'src/utils/date';
+import { asDateTimeString } from 'src/utils/date';
 import { mimeTypes } from 'src/utils/mime-types';
 import z from 'zod';
 
@@ -199,7 +199,7 @@ export function mapAsset(entity: MaybeDehydrated<MapAsset>, options: AssetMapOpt
       type: entity.type,
       originalMimeType: mimeTypes.lookup(entity.originalFileName),
       thumbhash: entity.thumbhash ? hexOrBufferToBase64(entity.thumbhash) : null,
-      localDateTime: asDateString(entity.localDateTime),
+      localDateTime: asDateTimeString(entity.localDateTime),
       duration: entity.duration,
       livePhotoVideoId: entity.livePhotoVideoId,
       hasMetadata: false,
@@ -211,7 +211,7 @@ export function mapAsset(entity: MaybeDehydrated<MapAsset>, options: AssetMapOpt
 
   return {
     id: entity.id,
-    createdAt: asDateString(entity.createdAt),
+    createdAt: asDateTimeString(entity.createdAt),
     ownerId: entity.ownerId,
     owner: entity.owner ? mapUser(entity.owner) : undefined,
     libraryId: entity.libraryId,
@@ -220,10 +220,10 @@ export function mapAsset(entity: MaybeDehydrated<MapAsset>, options: AssetMapOpt
     originalFileName: entity.originalFileName,
     originalMimeType: mimeTypes.lookup(entity.originalFileName),
     thumbhash: entity.thumbhash ? hexOrBufferToBase64(entity.thumbhash) : null,
-    fileCreatedAt: asDateString(entity.fileCreatedAt),
+    fileCreatedAt: asDateTimeString(entity.fileCreatedAt),
-    fileModifiedAt: asDateString(entity.fileModifiedAt),
+    fileModifiedAt: asDateTimeString(entity.fileModifiedAt),
-    localDateTime: asDateString(entity.localDateTime),
+    localDateTime: asDateTimeString(entity.localDateTime),
-    updatedAt: asDateString(entity.updatedAt),
+    updatedAt: asDateTimeString(entity.updatedAt),
     isFavorite: options.auth?.user.id === entity.ownerId && entity.isFavorite,
     isArchived: entity.visibility === AssetVisibility.Archive,
     isTrashed: !!entity.deletedAt,

server/src/dtos/exif.dto.ts

@@ -1,7 +1,7 @@
 import { createZodDto } from 'nestjs-zod';
 import { Exif } from 'src/database';
 import { MaybeDehydrated } from 'src/types';
-import { asDateString } from 'src/utils/date';
+import { asDateTimeString } from 'src/utils/date';
 import z from 'zod';
 
 export const ExifResponseSchema = z
@@ -44,8 +44,8 @@ export function mapExif(entity: MaybeDehydrated<Exif>): ExifResponseDto {
     exifImageHeight: entity.exifImageHeight,
     fileSizeInByte: entity.fileSizeInByte ? Number.parseInt(entity.fileSizeInByte.toString()) : null,
     orientation: entity.orientation,
-    dateTimeOriginal: asDateString(entity.dateTimeOriginal),
+    dateTimeOriginal: asDateTimeString(entity.dateTimeOriginal),
-    modifyDate: asDateString(entity.modifyDate),
+    modifyDate: asDateTimeString(entity.modifyDate),
     timeZone: entity.timeZone,
     lensModel: entity.lensModel,
     fNumber: entity.fNumber,

server/src/dtos/person.dto.ts

@@ -7,7 +7,7 @@ import { AssetEditActionItem } from 'src/dtos/editing.dto';
 import { SourceTypeSchema } from 'src/enum';
 import { AssetFaceTable } from 'src/schema/tables/asset-face.table';
 import { ImageDimensions, MaybeDehydrated } from 'src/types';
-import { asBirthDateString, asDateString } from 'src/utils/date';
+import { asDateString, asDateTimeString } from 'src/utils/date';
 import { transformFaceBoundingBox } from 'src/utils/transform';
 import { hexColor, stringToBool } from 'src/validation';
 import z from 'zod';
@@ -175,12 +175,12 @@ export function mapPerson(person: MaybeDehydrated<Person>): PersonResponseDto {
   return {
     id: person.id,
     name: person.name,
-    birthDate: asBirthDateString(person.birthDate),
+    birthDate: asDateString(person.birthDate),
     thumbnailPath: person.thumbnailPath,
     isHidden: person.isHidden,
     isFavorite: person.isFavorite,
     color: person.color ?? undefined,
-    updatedAt: asDateString(person.updatedAt),
+    updatedAt: asDateTimeString(person.updatedAt),
   };
 }
 

server/src/dtos/tag.dto.ts

@@ -1,7 +1,7 @@
 import { createZodDto } from 'nestjs-zod';
 import { Tag } from 'src/database';
 import { MaybeDehydrated } from 'src/types';
-import { asDateString } from 'src/utils/date';
+import { asDateTimeString } from 'src/utils/date';
 import { hexColor } from 'src/validation';
 import z from 'zod';
 
@@ -65,8 +65,8 @@ export function mapTag(entity: MaybeDehydrated<Tag>): TagResponseDto {
     parentId: entity.parentId ?? undefined,
     name: entity.value.split('/').at(-1) as string,
     value: entity.value,
-    createdAt: asDateString(entity.createdAt),
+    createdAt: asDateTimeString(entity.createdAt),
-    updatedAt: asDateString(entity.updatedAt),
+    updatedAt: asDateTimeString(entity.updatedAt),
     color: entity.color ?? undefined,
   };
 }

server/src/dtos/user.dto.ts

@@ -3,7 +3,7 @@ import { User, UserAdmin } from 'src/database';
 import { pinCodeRegex } from 'src/dtos/auth.dto';
 import { UserAvatarColor, UserAvatarColorSchema, UserMetadataKey, UserStatusSchema } from 'src/enum';
 import { MaybeDehydrated, UserMetadataItem } from 'src/types';
-import { asDateString } from 'src/utils/date';
+import { asDateTimeString } from 'src/utils/date';
 import { isoDatetimeToDate, sanitizeFilename, stringToBool, toEmail } from 'src/validation';
 import z from 'zod';
 
@@ -61,7 +61,7 @@ export const mapUser = (entity: MaybeDehydrated<User | UserAdmin>): UserResponse
     name: entity.name,
     profileImagePath: entity.profileImagePath,
     avatarColor: entity.avatarColor ?? emailToAvatarColor(entity.email),
-    profileChangedAt: asDateString(entity.profileChangedAt),
+    profileChangedAt: asDateTimeString(entity.profileChangedAt),
   };
 };
 

server/src/services/album.service.ts

@@ -18,7 +18,7 @@ import { AlbumUserRole, Permission } from 'src/enum';
 import { AlbumAssetCount, AlbumInfoOptions } from 'src/repositories/album.repository';
 import { BaseService } from 'src/services/base.service';
 import { addAssets, removeAssets } from 'src/utils/asset.util';
-import { asDateString } from 'src/utils/date';
+import { asDateTimeString } from 'src/utils/date';
 import { getPreferences } from 'src/utils/preferences';
 
 @Injectable()
@@ -59,11 +59,11 @@ export class AlbumService extends BaseService {
     return albums.map((album) => ({
       ...mapAlbum(album),
       sharedLinks: undefined,
-      startDate: asDateString(albumMetadata[album.id]?.startDate ?? undefined),
+      startDate: asDateTimeString(albumMetadata[album.id]?.startDate ?? undefined),
-      endDate: asDateString(albumMetadata[album.id]?.endDate ?? undefined),
+      endDate: asDateTimeString(albumMetadata[album.id]?.endDate ?? undefined),
       assetCount: albumMetadata[album.id]?.assetCount ?? 0,
       // lastModifiedAssetTimestamp is only used in mobile app, please remove if not need
-      lastModifiedAssetTimestamp: asDateString(albumMetadata[album.id]?.lastModifiedAssetTimestamp ?? undefined),
+      lastModifiedAssetTimestamp: asDateTimeString(albumMetadata[album.id]?.lastModifiedAssetTimestamp ?? undefined),
     }));
   }
 
@@ -79,10 +79,10 @@ export class AlbumService extends BaseService {
 
     return {
       ...mapAlbum(album),
-      startDate: asDateString(albumMetadataForIds?.startDate ?? undefined),
+      startDate: asDateTimeString(albumMetadataForIds?.startDate ?? undefined),
-      endDate: asDateString(albumMetadataForIds?.endDate ?? undefined),
+      endDate: asDateTimeString(albumMetadataForIds?.endDate ?? undefined),
       assetCount: albumMetadataForIds?.assetCount ?? 0,
-      lastModifiedAssetTimestamp: asDateString(albumMetadataForIds?.lastModifiedAssetTimestamp ?? undefined),
+      lastModifiedAssetTimestamp: asDateTimeString(albumMetadataForIds?.lastModifiedAssetTimestamp ?? undefined),
       contributorCounts: isShared ? await this.albumRepository.getContributorCounts(album.id) : undefined,
     };
   }

server/src/utils/date.spec.ts

@@ -0,0 +1,33 @@
+import { asDateString, asDateTimeString } from 'src/utils/date';
+import { describe, expect, it } from 'vitest';
+
+describe('asDateString', () => {
+  it('should return null for null input', () => {
+    expect(asDateString(null)).toBeNull();
+  });
+
+  it('should pass through a pre-serialized string unchanged', () => {
+    expect(asDateString('2000-01-15')).toBe('2000-01-15');
+  });
+
+  it('should return the local calendar date, not the UTC date', () => {
+    const date = new Date(2000, 0, 15); // 15 Jan 2000, local midnight
+    expect(asDateString(date)).toBe('2000-01-15');
+  });
+});
+
+describe('asDateTimeString', () => {
+  it('should return null for null input', () => {
+    expect(asDateTimeString(null)).toBeNull();
+  });
+
+  it('should pass through a pre-serialized string unchanged', () => {
+    const iso = '2000-01-15T12:00:00.000Z';
+    expect(asDateTimeString(iso)).toBe(iso);
+  });
+
+  it('should return an ISO 8601 datetime string for a Date', () => {
+    const date = new Date('2000-01-15T12:00:00.000Z');
+    expect(asDateTimeString(date)).toBe('2000-01-15T12:00:00.000Z');
+  });
+});

server/src/utils/date.ts

@@ -1,23 +1,18 @@
 import { DateTime } from 'luxon';
+import { isoDateToDate, isoDatetimeToDate } from 'src/validation';
 
 /**
  * Convert a date to a ISO 8601 datetime string.
- * @param x - The date to convert.
- * @returns The ISO 8601 datetime string.
- * @deprecated Remove this and all references when using `ZodSerializerDto` on the controllers. Then the codec in `isoDatetimeToDate` in validation.ts will handle the conversion instead.
  */
-export const asDateString = <T extends Date | string | undefined | null>(x: T) => {
+export const asDateTimeString = <T extends Date | string | undefined | null>(x: T) => {
-  return x instanceof Date ? x.toISOString() : (x as Exclude<T, Date>);
+  return x instanceof Date ? isoDatetimeToDate.encode(x) : (x as Exclude<T, Date>);
 };
 
 /**
- * Convert a date to a date string.
+ * Convert a date to a date string (yyyy-mm-dd).
- * @param x - The date to convert.
- * @returns The date string.
- * @deprecated Remove this and all references when using `ZodSerializerDto` on the controllers. Then the codec in `isoDateToDate` in validation.ts will handle the conversion instead.
  */
-export const asBirthDateString = (x: Date | string | null): string | null => {
+export const asDateString = (x: Date | string | null): string | null => {
-  return x instanceof Date ? x.toISOString().split('T')[0] : x;
+  return x instanceof Date ? isoDateToDate.encode(x) : x;
 };
 
 export const extractTimeZone = (dateTimeOriginal?: string | null) => {

server/src/validation.ts

@@ -166,7 +166,12 @@ export const isoDateToDate = z
     z.date(),
     {
       decode: (isoString) => new Date(isoString),
-      encode: (date) => date.toISOString().slice(0, 10),
+      encode: (date) => {
+        const y = date.getFullYear();
+        const m = String(date.getMonth() + 1).padStart(2, '0');
+        const d = String(date.getDate()).padStart(2, '0');
+        return `${y}-${m}-${d}`;
+      },
     },
   )
   .meta({ example: '2024-01-01' });