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37 lines
1.8 KiB
37 lines
1.8 KiB
import toInteger from '../toInteger/index.js';
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import toDate from '../../toDate/index.js';
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import startOfUTCWeek from '../startOfUTCWeek/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 getUTCWeekYear(dirtyDate, dirtyOptions) {
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requiredArgs(1, arguments);
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var date = toDate(dirtyDate, dirtyOptions);
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var year = date.getUTCFullYear();
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var options = dirtyOptions || {};
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var locale = options.locale;
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var localeFirstWeekContainsDate = locale && locale.options && locale.options.firstWeekContainsDate;
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var defaultFirstWeekContainsDate = localeFirstWeekContainsDate == null ? 1 : toInteger(localeFirstWeekContainsDate);
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var firstWeekContainsDate = options.firstWeekContainsDate == null ? defaultFirstWeekContainsDate : toInteger(options.firstWeekContainsDate); // Test if weekStartsOn is between 1 and 7 _and_ is not NaN
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if (!(firstWeekContainsDate >= 1 && firstWeekContainsDate <= 7)) {
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throw new RangeError('firstWeekContainsDate must be between 1 and 7 inclusively');
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}
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var firstWeekOfNextYear = new Date(0);
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firstWeekOfNextYear.setUTCFullYear(year + 1, 0, firstWeekContainsDate);
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firstWeekOfNextYear.setUTCHours(0, 0, 0, 0);
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var startOfNextYear = startOfUTCWeek(firstWeekOfNextYear, dirtyOptions);
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var firstWeekOfThisYear = new Date(0);
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firstWeekOfThisYear.setUTCFullYear(year, 0, firstWeekContainsDate);
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firstWeekOfThisYear.setUTCHours(0, 0, 0, 0);
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var startOfThisYear = startOfUTCWeek(firstWeekOfThisYear, dirtyOptions);
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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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} |