84 lines
2.4 KiB
TypeScript
84 lines
2.4 KiB
TypeScript
/** 中国星期名称 */
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const WEEKDAY_CN = ["周日", "周一", "周二", "周三", "周四", "周五", "周六"] as const;
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/** 中国时区 */
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const TZ = "Asia/Shanghai";
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/**
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* 获取中国时区下的日期数字（月、日、星期）
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*/
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function getChinaDateParts(): { year: number; month: number; day: number; weekday: number } {
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const now = new Date();
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const formatter = new Intl.DateTimeFormat("en-CA", {
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timeZone: TZ,
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year: "numeric",
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month: "numeric",
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day: "numeric",
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weekday: "short",
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});
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const parts = formatter.formatToParts(now);
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const get = (type: string) => parseInt(parts.find((p) => p.type === type)?.value ?? "0", 10);
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const weekdayStr = parts.find((p) => p.type === "weekday")?.value ?? "Sun";
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const weekdayMap: Record<string, number> = { Sun: 0, Mon: 1, Tue: 2, Wed: 3, Thu: 4, Fri: 5, Sat: 6 };
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return {
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year: get("year"),
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month: get("month"),
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day: get("day"),
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weekday: weekdayMap[weekdayStr] ?? 0,
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};
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}
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/**
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* 格式化为中文日期：M月D日 周X
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*/
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function formatDateCN(month: number, day: number, weekday: number): string {
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return `${month}月${day}日 ${WEEKDAY_CN[weekday]}`;
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}
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/**
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* 获取下一个周六、周日的日期（中国日历）
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* session-1 对应周六，session-2 对应周日
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*/
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export function getNextWeekendDates(): { saturday: string; sunday: string } {
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const { year, month, day, weekday } = getChinaDateParts();
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let satM = month;
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let satD = day;
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let satW = 6;
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let sunM = month;
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let sunD = day;
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let sunW = 0;
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if (weekday === 0) {
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// 今天周日：下周六 +6 天，下周日 +7 天
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const d = new Date(year, month - 1, day);
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d.setDate(d.getDate() + 6);
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satM = d.getMonth() + 1;
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satD = d.getDate();
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d.setDate(d.getDate() + 1);
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sunM = d.getMonth() + 1;
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sunD = d.getDate();
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} else if (weekday === 6) {
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// 今天周六：明天周日
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const d = new Date(year, month - 1, day);
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d.setDate(d.getDate() + 1);
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sunM = d.getMonth() + 1;
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sunD = d.getDate();
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} else {
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// 周一至周五
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const daysToSat = 6 - weekday;
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const d = new Date(year, month - 1, day);
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d.setDate(d.getDate() + daysToSat);
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satM = d.getMonth() + 1;
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satD = d.getDate();
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d.setDate(d.getDate() + 1);
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sunM = d.getMonth() + 1;
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sunD = d.getDate();
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}
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return {
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saturday: formatDateCN(satM, satD, 6),
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sunday: formatDateCN(sunM, sunD, 0),
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};
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}
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