92 lines
2.7 KiB
JavaScript
92 lines
2.7 KiB
JavaScript
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/**
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* Returns the [year, month, day, hour, minute, seconds] tokens of the provided
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* `date` as it will be rendered in the `timeZone`.
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*/
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export default function tzTokenizeDate(date, timeZone) {
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var dtf = getDateTimeFormat(timeZone)
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return dtf.formatToParts ? partsOffset(dtf, date) : hackyOffset(dtf, date)
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}
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var typeToPos = {
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year: 0,
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month: 1,
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day: 2,
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hour: 3,
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minute: 4,
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second: 5,
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}
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function partsOffset(dtf, date) {
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try {
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var formatted = dtf.formatToParts(date)
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var filled = []
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for (var i = 0; i < formatted.length; i++) {
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var pos = typeToPos[formatted[i].type]
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if (pos >= 0) {
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filled[pos] = parseInt(formatted[i].value, 10)
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}
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}
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return filled
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} catch (error) {
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if (error instanceof RangeError) {
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return [NaN]
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}
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throw error
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}
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}
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function hackyOffset(dtf, date) {
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var formatted = dtf.format(date).replace(/\u200E/g, '')
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var parsed = /(\d+)\/(\d+)\/(\d+),? (\d+):(\d+):(\d+)/.exec(formatted)
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// var [, fMonth, fDay, fYear, fHour, fMinute, fSecond] = parsed
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// return [fYear, fMonth, fDay, fHour, fMinute, fSecond]
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return [parsed[3], parsed[1], parsed[2], parsed[4], parsed[5], parsed[6]]
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}
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// Get a cached Intl.DateTimeFormat instance for the IANA `timeZone`. This can be used
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// to get deterministic local date/time output according to the `en-US` locale which
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// can be used to extract local time parts as necessary.
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var dtfCache = {}
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function getDateTimeFormat(timeZone) {
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if (!dtfCache[timeZone]) {
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// New browsers use `hourCycle`, IE and Chrome <73 does not support it and uses `hour12`
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var testDateFormatted = new Intl.DateTimeFormat('en-US', {
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hour12: false,
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timeZone: 'America/New_York',
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year: 'numeric',
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month: 'numeric',
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day: '2-digit',
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hour: '2-digit',
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minute: '2-digit',
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second: '2-digit',
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}).format(new Date('2014-06-25T04:00:00.123Z'))
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var hourCycleSupported =
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testDateFormatted === '06/25/2014, 00:00:00' ||
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testDateFormatted === '06/25/2014 00:00:00'
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dtfCache[timeZone] = hourCycleSupported
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? new Intl.DateTimeFormat('en-US', {
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hour12: false,
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timeZone: timeZone,
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year: 'numeric',
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month: 'numeric',
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day: '2-digit',
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hour: '2-digit',
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minute: '2-digit',
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second: '2-digit',
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})
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: new Intl.DateTimeFormat('en-US', {
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hourCycle: 'h23',
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timeZone: timeZone,
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year: 'numeric',
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month: 'numeric',
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day: '2-digit',
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hour: '2-digit',
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minute: '2-digit',
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second: '2-digit',
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})
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}
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return dtfCache[timeZone]
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}
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