33 lines
1.4 KiB
JavaScript
33 lines
1.4 KiB
JavaScript
import tzParseTimezone from '../_lib/tzParseTimezone/index.js'
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/**
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* @name getTimezoneOffset
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* @category Time Zone Helpers
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* @summary Gets the offset in milliseconds between the time zone and Universal Coordinated Time (UTC)
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*
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* @description
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* Returns the time zone offset from UTC time in milliseconds for IANA time zones as well
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* as other time zone offset string formats.
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*
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* For time zones where daylight savings time is applicable a `Date` should be passed on
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* the second parameter to ensure the offset correctly accounts for DST at that time of
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* year. When omitted, the current date is used.
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*
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* @param {String} timeZone - the time zone of this local time, can be an offset or IANA time zone
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* @param {Date|Number} [date] - the date with values representing the local time
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* @returns {Number} the time zone offset in milliseconds
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*
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* @example
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* const result = getTimezoneOffset('-07:00')
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* //=> -18000000 (-7 * 60 * 60 * 1000)
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* const result = getTimezoneOffset('Africa/Johannesburg')
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* //=> 7200000 (2 * 60 * 60 * 1000)
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* const result = getTimezoneOffset('America/New_York', new Date(2016, 0, 1))
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* //=> -18000000 (-5 * 60 * 60 * 1000)
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* const result = getTimezoneOffset('America/New_York', new Date(2016, 6, 1))
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* //=> -14400000 (-4 * 60 * 60 * 1000)
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*/
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export default function getTimezoneOffset(timeZone, date) {
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return -tzParseTimezone(timeZone, date)
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}
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