fixed the publishedAt

src/modules/blog/dto/create-blog.dto.ts

@@ -44,5 +44,5 @@ export class CreateBlogDto {
   @ApiPropertyOptional({ description: 'Publication date' })
   @IsDateString()
   @IsOptional()
-  publishedAt?: Date;
+  publishedAt?: string;
 }

src/modules/blog/services/blogs.service.ts

@@ -15,6 +15,7 @@ export class BlogsService {
       data: {
         ...createBlogDto,
         tags: createBlogDto.tags || [],
+        publishedAt: createBlogDto.publishedAt ? new Date(createBlogDto.publishedAt) : null
       },
     });