refactor(server): 日期工具统一迁入 dayjs（utc 插件），移除手写 Intl/padStart 重复实现

apps/server/package.json

@@ -45,6 +45,7 @@
     "class-transformer": "^0.5.1",
     "class-validator": "^0.15.1",
     "compression": "^1.8.1",
+    "dayjs": "^1.11.21",
     "dotenv": "^17.4.1",
     "exceljs": "^4.4.0",
     "express": "^5.2.1",

apps/server/src/agent-context/pending-tasks.service.ts

@@ -1,4 +1,5 @@
 import { Injectable } from '@nestjs/common';
+import dayjs from '../common/dayjs';
 import { DataSource } from 'typeorm';
 import type { AgentToolContext } from '../agent-tools/agent-tool.types';
 import type { StudentAccessScope } from '../students/student-access-scope';
@@ -55,20 +56,11 @@ function teacherScopedCountSql(sql: (scope: StudentAccessScope) => string): SqlB
 }
 
 function today(): string {
-  const now = new Date();
-  const year = now.getFullYear();
-  const month = String(now.getMonth() + 1).padStart(2, '0');
-  const day = String(now.getDate()).padStart(2, '0');
-  return `${year}-${month}-${day}`;
+  return dayjs().format('YYYY-MM-DD');
 }
 
 function inDays(days: number): string {
-  const date = new Date();
-  date.setDate(date.getDate() + days);
-  const year = date.getFullYear();
-  const month = String(date.getMonth() + 1).padStart(2, '0');
-  const day = String(date.getDate()).padStart(2, '0');
-  return `${year}-${month}-${day}`;
+  return dayjs().add(days, 'day').format('YYYY-MM-DD');
 }
 
 const TASKS: readonly TaskDefinition[] = [

apps/server/src/attendance/attendance-generation.service.ts

@@ -11,6 +11,7 @@ import {
   ScheduleType,
 } from '../entities';
 import { toMinutes, isClassStudentActiveOnDate } from './attendance-time';
+import dayjs from '../common/dayjs';
 import type { BatchCreateAttendanceDto, GenerateAttendanceFromSchedulesDto, GenerateFromSchedulesDto, SaveAttendancePeriodConfigsDto } from './dto/attendance.dto';
 
 @Injectable()
@@ -162,23 +163,15 @@ export class AttendanceGenerationService {
   }
 
   private getCourseClock(date: Date): { date: string; minutes: number } {
-    const parts = Object.fromEntries(
-      new Intl.DateTimeFormat('en-CA', {
-        timeZone: 'Asia/Shanghai',
-        year: 'numeric', month: '2-digit', day: '2-digit',
-        hour: '2-digit', minute: '2-digit', hourCycle: 'h23',
-      }).formatToParts(date).filter((part) => part.type !== 'literal').map((part) => [part.type, part.value]),
-    );
+    const c = dayjs.utc(date).add(8, 'hour');
     return {
-      date: `${parts.year}-${parts.month}-${parts.day}`,
-      minutes: Number(parts.hour) * 60 + Number(parts.minute),
+      date: c.format('YYYY-MM-DD'),
+      minutes: c.hour() * 60 + c.minute(),
     };
   }
 
   private shiftDate(date: string, days: number): string {
-    const shifted = new Date(`${date}T00:00:00.000Z`);
-    shifted.setUTCDate(shifted.getUTCDate() + days);
-    return shifted.toISOString().slice(0, 10);
+    return dayjs.utc(`${date}T00:00:00.000Z`).add(days, 'day').format('YYYY-MM-DD');
   }
 
   private async ensureAttendancePeriodConfigs() {

apps/server/src/attendance/attendance-settlement.service.ts

@@ -1,4 +1,5 @@
 import { BadRequestException, Injectable, Logger } from '@nestjs/common';
+import dayjs from '../common/dayjs';
 import { Cron } from '@nestjs/schedule';
 import { InjectRepository } from '@nestjs/typeorm';
 import { In, LessThan, LessThanOrEqual, MoreThanOrEqual, Repository } from 'typeorm';
@@ -283,18 +284,13 @@ export class AttendanceSettlementService {
   }
 
   private getCourseClock(date: Date): { date: string; weekDay: number; minutes: number } {
-    const parts = Object.fromEntries(
-      new Intl.DateTimeFormat('en-CA', {
-        timeZone: this.courseTimeZone,
-        year: 'numeric', month: '2-digit', day: '2-digit', weekday: 'short',
-        hour: '2-digit', minute: '2-digit', hourCycle: 'h23',
-      }).formatToParts(date).filter((part) => part.type !== 'literal').map((part) => [part.type, part.value]),
-    );
-    const weekDays: Record<string, number> = { Mon: 1, Tue: 2, Wed: 3, Thu: 4, Fri: 5, Sat: 6, Sun: 7 };
+    // Asia/Shanghai 无夏令时，固定 UTC+8 与 Intl 时区格式化等价
+    const c = dayjs.utc(date).add(8, 'hour');
+    const weekDay = c.day() === 0 ? 7 : c.day();
     return {
-      date: `${parts.year}-${parts.month}-${parts.day}`,
-      weekDay: weekDays[parts.weekday],
-      minutes: Number(parts.hour) * 60 + Number(parts.minute),
+      date: c.format('YYYY-MM-DD'),
+      weekDay,
+      minutes: c.hour() * 60 + c.minute(),
     };
   }
 

apps/server/src/attendance/attendance-time.ts

@@ -1,22 +1,20 @@
+import dayjs from '../common/dayjs';
+
 export function toMinutes(time: string): number {
   const [hour, minute] = time.split(':').map(Number);
   return hour * 60 + minute;
 }
 
 export function getCourseClock(date: Date): { date: string; minutes: number } {
-  const year = date.getFullYear();
-  const month = String(date.getMonth() + 1).padStart(2, '0');
-  const day = String(date.getDate()).padStart(2, '0');
+  const d = dayjs(date);
   return {
-    date: `${year}-${month}-${day}`,
-    minutes: date.getHours() * 60 + date.getMinutes(),
+    date: d.format('YYYY-MM-DD'),
+    minutes: d.hour() * 60 + d.minute(),
   };
 }
 
 export function shiftDate(date: string, days: number): string {
-  const d = new Date(`${date}T00:00:00.000Z`);
-  d.setUTCDate(d.getUTCDate() + days);
-  return d.toISOString().slice(0, 10);
+  return dayjs.utc(`${date}T00:00:00.000Z`).add(days, 'day').format('YYYY-MM-DD');
 }
 
 export function mapLessonScheduleTimeToSession(startTime: string): string {

apps/server/src/attendance/attendance.controller-base.ts

@@ -1,4 +1,5 @@
 import { UseGuards } from '@nestjs/common';
+import dayjs from '../common/dayjs';
 import { AttendanceService } from './attendance.service';
 import { AttendanceImportService } from './attendance-import.service';
 import { OperationLogsService } from '../operation-logs/operation-logs.service';
@@ -32,11 +33,7 @@ export abstract class AttendanceControllerBase {
   ) {}
 
   protected getTodayDateOnly(): string {
-    const today = new Date();
-    const year = today.getFullYear();
-    const month = String(today.getMonth() + 1).padStart(2, '0');
-    const day = String(today.getDate()).padStart(2, '0');
-    return `${year}-${month}-${day}`;
+    return dayjs().format('YYYY-MM-DD');
   }
 
   protected canManageAllAttendance(req: { user: RequestUser }): boolean {

apps/server/src/common/dayjs.ts

@@ -0,0 +1,7 @@
+import dayjs from 'dayjs';
+import utc from 'dayjs/plugin/utc';
+
+// 服务端统一 dayjs 实例：扩展 utc 插件以支持固定时区（Asia/Shanghai 无夏令时，恒为 UTC+8）。
+dayjs.extend(utc);
+
+export default dayjs;

apps/server/src/rbac/rbac-presets.ts

@@ -144,33 +144,13 @@ export const DEPRECATED_PERMISSION_CODES = [
 ] as const;
 
 export const DEPRECATED_PERMISSION_CODE_SET = new Set<string>(DEPRECATED_PERMISSION_CODES);
+import dayjs from '../common/dayjs';
 
 export function getChinaDateParts(date = new Date()): { date: string; weekDay: number } {
-  const parts = Object.fromEntries(
-    new Intl.DateTimeFormat('en-CA', {
-      timeZone: 'Asia/Shanghai',
-      year: 'numeric',
-      month: '2-digit',
-      day: '2-digit',
-      weekday: 'short',
-    })
-      .formatToParts(date)
-      .filter((part) => part.type !== 'literal')
-      .map((part) => [part.type, part.value]),
-  );
-  const weekDays: Record<string, number> = {
-    Mon: 1,
-    Tue: 2,
-    Wed: 3,
-    Thu: 4,
-    Fri: 5,
-    Sat: 6,
-    Sun: 7,
-  };
-  return {
-    date: `${parts.year}-${parts.month}-${parts.day}`,
-    weekDay: weekDays[parts.weekday],
-  };
+  // Asia/Shanghai 无夏令时，固定 UTC+8 与 Intl en-CA 格式化等价
+  const c = dayjs.utc(date).add(8, 'hour');
+  const weekDay = c.day() === 0 ? 7 : c.day();
+  return { date: c.format('YYYY-MM-DD'), weekDay };
 }
 
 export const PRESET_ROLES: Array<{

package-lock.json

@@ -108,6 +108,7 @@
         "class-transformer": "^0.5.1",
         "class-validator": "^0.15.1",
         "compression": "^1.8.1",
+        "dayjs": "^1.11.21",
         "dotenv": "^17.4.1",
         "exceljs": "^4.4.0",
         "express": "^5.2.1",