37 lines
1.9 KiB
JavaScript
37 lines
1.9 KiB
JavaScript
import { toDate } from '../toDate/index.js';
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import { tzPattern } from '../_lib/tzPattern/index.js';
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import { tzParseTimezone } from '../_lib/tzParseTimezone/index.js';
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import { newDateUTC } from '../_lib/newDateUTC/index.js';
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/**
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* @name fromZonedTime
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* @category Time Zone Helpers
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* @summary Get the UTC date/time from a date representing local time in a given time zone
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*
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* @description
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* Returns a date instance with the UTC time of the provided date of which the values
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* represented the local time in the time zone specified. In other words, if the input
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* date represented local time in time zone, the timestamp of the output date will
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* give the equivalent UTC of that local time regardless of the current system time zone.
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*
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* @param date the date with values representing the local time
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* @param timeZone the time zone of this local time, can be an offset or IANA time zone
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* @param options the object with options. See [Options]{@link https://date-fns.org/docs/Options}
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* @param {0|1|2} [options.additionalDigits=2] - passed to `toDate`. See [toDate]{@link https://date-fns.org/docs/toDate}
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* @throws {TypeError} 2 arguments required
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* @throws {RangeError} `options.additionalDigits` must be 0, 1 or 2
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*
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* @example
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* // In June 10am in Los Angeles is 5pm UTC
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* const result = fromZonedTime(new Date(2014, 5, 25, 10, 0, 0), 'America/Los_Angeles')
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* //=> 2014-06-25T17:00:00.000Z
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*/
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export function fromZonedTime(date, timeZone, options) {
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if (typeof date === 'string' && !date.match(tzPattern)) {
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return toDate(date, { ...options, timeZone });
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}
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date = toDate(date, options);
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const utc = newDateUTC(date.getFullYear(), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds(), date.getMilliseconds()).getTime();
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const offsetMilliseconds = tzParseTimezone(timeZone, new Date(utc));
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return new Date(utc + offsetMilliseconds);
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}
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