feat(timezone): implement UTC and Beijing time conversion utilities and update bid handling

- Add functions to convert between UTC and Beijing time in timezone utility.
- Update BidsService to return latest update and publish dates in Beijing time.
- Modify BidCrawlerService to store publish dates in UTC format.
- Change database timezone configuration to UTC for consistency.

src/bids/services/bid.service.ts

@@ -7,6 +7,7 @@ import {
   getDaysAgo,
   setStartOfDay,
   setEndOfDay,
+  utcToBeijing,
 } from '../../common/utils/timezone.util';
 
 interface FindAllQuery {
@@ -23,7 +24,7 @@ interface SourceResult {
 export interface CrawlInfoAddStats {
   source: string;
   count: number;
-  latestUpdate: Date | string;
+  latestUpdate: Date | string | null;
   latestPublishDate: Date | string | null;
   error: string | null;
 }
@@ -164,7 +165,7 @@ export class BidsService {
         count,
         latestPublishDate,
         error,
-        strftime('%Y-%m-%d %H:%M:%S', createdAt, '+8 hours') as latestUpdate
+        createdAt as latestUpdate
       FROM crawl_info_add
       WHERE (source, createdAt) IN (
         SELECT source, MAX(createdAt)
@@ -177,16 +178,26 @@ export class BidsService {
     const results =
       await this.crawlInfoRepository.query<CrawlInfoAddRawResult[]>(query);
 
-    return results.map((item) => ({
+    return results.map((item) => {
+      // 将UTC时间转换为北京时间显示
+      const latestUpdateBeijing = item.latestUpdate
+        ? utcToBeijing(new Date(item.latestUpdate))
+        : null;
+      const latestPublishDateBeijing = item.latestPublishDate
+        ? utcToBeijing(new Date(item.latestPublishDate))
+        : null;
+
+      return {
         source: String(item.source),
         count: Number(item.count),
-      latestUpdate: item.latestUpdate,
+        latestUpdate: latestUpdateBeijing,
-      latestPublishDate: item.latestPublishDate,
+        latestPublishDate: latestPublishDateBeijing,
         // 确保 error 字段正确处理：null 或空字符串都转换为 null，非空字符串保留
         error:
           item.error && String(item.error).trim() !== ''
             ? String(item.error)
             : null,
-    }));
+      };
+    });
   }
 }

src/common/utils/timezone.util.ts

@@ -5,6 +5,26 @@
 
 const TIMEZONE_OFFSET = 8 * 60 * 60 * 1000;
 
+/**
+ * 将北京时间(+8)转换为UTC
+ * 用于将爬取的北京时间字符串解析后的Date对象转为UTC存储
+ * @param date 北京时间的Date对象
+ * @returns UTC时间的Date对象
+ */
+export function beijingToUtc(date: Date): Date {
+  return new Date(date.getTime() - TIMEZONE_OFFSET);
+}
+
+/**
+ * 将UTC时间转换为北京时间(+8)
+ * 用于将数据库中的UTC时间转为北京时间显示
+ * @param date UTC时间的Date对象
+ * @returns 北京时间的Date对象
+ */
+export function utcToBeijing(date: Date): Date {
+  return new Date(date.getTime() + TIMEZONE_OFFSET);
+}
+
 /**
  * 获取当前时间的东八区Date对象
  * @returns Date 当前时间的东八区表示

src/crawler/services/bid-crawler.service.ts

@@ -4,6 +4,7 @@ import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
 import * as puppeteer from 'puppeteer';
 import { BidsService } from '../../bids/services/bid.service';
+import { beijingToUtc } from '../../common/utils/timezone.util';
 import { CrawlInfoAdd } from '../entities/crawl-info-add.entity';
 import { ChdtpCrawler } from './chdtp_target';
 import { ChngCrawler } from './chng_target';
@@ -146,19 +147,21 @@ export class BidCrawlerService {
               : null;
 
           for (const item of results) {
+            // 将北京时间转换为UTC存储
+            const publishDateUtc = beijingToUtc(new Date(item.publishDate));
             await this.bidsService.createOrUpdate({
               title: item.title,
               url: item.url,
-              publishDate: item.publishDate,
+              publishDate: publishDateUtc,
               source: crawler.name,
             });
           }
 
-          // 保存爬虫统计信息到数据库
+          // 保存爬虫统计信息到数据库（将北京时间转为UTC）
           await this.saveCrawlInfo(
             crawler.name,
             results.length,
-            latestPublishDate,
+            latestPublishDate ? beijingToUtc(latestPublishDate) : null,
           );
         } catch (err) {
           const errorMessage = err instanceof Error ? err.message : String(err);
@@ -219,11 +222,11 @@ export class BidCrawlerService {
               });
             }
 
-            // 更新爬虫统计信息到数据库
+            // 更新爬虫统计信息到数据库（将北京时间转为UTC）
             await this.saveCrawlInfo(
               crawler.name,
               results.length,
-              latestPublishDate,
+              latestPublishDate ? beijingToUtc(latestPublishDate) : null,
             );
           } catch (err) {
             const errorMessage =
@@ -361,19 +364,21 @@ export class BidCrawlerService {
           : null;
 
       for (const item of results) {
+        // 将北京时间转换为UTC存储
+        const publishDateUtc = beijingToUtc(new Date(item.publishDate));
         await this.bidsService.createOrUpdate({
           title: item.title,
           url: item.url,
-          publishDate: item.publishDate,
+          publishDate: publishDateUtc,
           source: targetCrawler.name,
         });
       }
 
-      // 保存爬虫统计信息到数据库
+      // 保存爬虫统计信息到数据库（将北京时间转为UTC）
       await this.saveCrawlInfo(
         targetCrawler.name,
         results.length,
-        latestPublishDate,
+        latestPublishDate ? beijingToUtc(latestPublishDate) : null,
       );
 
       return {

src/database/database.module.ts

@@ -20,7 +20,7 @@ import { ConfigModule, ConfigService } from '@nestjs/config';
         database: configService.get<string>('DATABASE_NAME', 'bidding'),
         entities: [__dirname + '/../**/*.entity{.ts,.js}'],
         synchronize: false,
-        timezone: '+08:00',
+        timezone: 'Z',
       }),
     }),
   ],