35 lines
1.1 KiB
TypeScript
35 lines
1.1 KiB
TypeScript
import { format } from 'date-fns';
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import { toZonedTime } from 'date-fns-tz';
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export const TAIPEI_TIME_ZONE = 'Asia/Taipei';
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const defaultFormatter = 'yyyy/MM/dd HH:mm:ss';
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function assertIsoDate(utcDateString: string): Date {
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const sourceDate = new Date(utcDateString);
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if (Number.isNaN(sourceDate.getTime())) {
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throw new Error(`非法的 UTC 時間戳：${utcDateString}`);
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}
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return sourceDate;
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}
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export function toTaipeiDate(utcDateString: string): Date {
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const source = assertIsoDate(utcDateString);
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return toZonedTime(source, TAIPEI_TIME_ZONE);
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}
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export function formatToTaipeiTime(utcDateString: string, formatString = defaultFormatter): string {
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const taipeiDate = toTaipeiDate(utcDateString);
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return format(taipeiDate, formatString);
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}
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export function isTodayTaipei(utcDateString: string, now = new Date()): boolean {
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const target = toTaipeiDate(utcDateString);
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const local = toZonedTime(now, TAIPEI_TIME_ZONE);
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return (
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target.getFullYear() === local.getFullYear()
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&& target.getMonth() === local.getMonth()
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&& target.getDate() === local.getDate()
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);
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}
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