46 lines
1.0 KiB
TypeScript
46 lines
1.0 KiB
TypeScript
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import dayjs from "dayjs";
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const ISO8601_OFFSET_FORMAT = /^(.*)([+-])(\d{2}):(\d{2})|(Z)$/;
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// @see https://github.com/iamkun/dayjs/issues/651#issuecomment-763033265
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// decorates dayjs in order to keep the utcOffset of the given date string
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// ; natively dayjs auto-converts to local time & losing utcOffset info.
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export function parseZone(
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date?: dayjs.ConfigType,
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format?: dayjs.OptionType,
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locale?: string,
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strict?: boolean
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) {
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if (typeof date !== "string") {
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return dayjs(date, format, locale, strict);
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}
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const match = date.match(ISO8601_OFFSET_FORMAT);
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if (match === null) {
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return;
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}
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if (match[0] === "Z") {
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return dayjs(
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date,
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{
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utc: true,
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...format,
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},
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locale,
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strict
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);
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}
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const [, dateTime, sign, tzHour, tzMinute] = match;
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const uOffset: number = tzHour * 60 + parseInt(tzMinute, 10);
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const offset = sign === "+" ? uOffset : -uOffset;
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return dayjs(
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dateTime,
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{
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$offset: offset,
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...format,
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} as dayjs.OptionType,
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locale,
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strict
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);
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}
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