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/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(),
     };
   }