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26 lines
1.1 KiB
26 lines
1.1 KiB
3 years ago
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import toDate from '../../toDate/index.js';
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import startOfUTCISOWeek from '../startOfUTCISOWeek/index.js';
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import requiredArgs from '../requiredArgs/index.js'; // This function will be a part of public API when UTC function will be implemented.
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// See issue: https://github.com/date-fns/date-fns/issues/376
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export default function getUTCISOWeekYear(dirtyDate) {
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requiredArgs(1, arguments);
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var date = toDate(dirtyDate);
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var year = date.getUTCFullYear();
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var fourthOfJanuaryOfNextYear = new Date(0);
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fourthOfJanuaryOfNextYear.setUTCFullYear(year + 1, 0, 4);
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fourthOfJanuaryOfNextYear.setUTCHours(0, 0, 0, 0);
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var startOfNextYear = startOfUTCISOWeek(fourthOfJanuaryOfNextYear);
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var fourthOfJanuaryOfThisYear = new Date(0);
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fourthOfJanuaryOfThisYear.setUTCFullYear(year, 0, 4);
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fourthOfJanuaryOfThisYear.setUTCHours(0, 0, 0, 0);
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var startOfThisYear = startOfUTCISOWeek(fourthOfJanuaryOfThisYear);
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if (date.getTime() >= startOfNextYear.getTime()) {
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return year + 1;
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} else if (date.getTime() >= startOfThisYear.getTime()) {
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return year;
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} else {
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return year - 1;
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}
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}
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