cal.pub0.org/packages/lib/parse-zone.ts

46 lines
1.2 KiB
TypeScript

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