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24 lines
1.1 KiB
24 lines
1.1 KiB
3 years ago
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import toInteger from '../toInteger/index.js';
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import toDate from '../../toDate/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 startOfUTCWeek(dirtyDate, dirtyOptions) {
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requiredArgs(1, arguments);
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var options = dirtyOptions || {};
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var locale = options.locale;
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var localeWeekStartsOn = locale && locale.options && locale.options.weekStartsOn;
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var defaultWeekStartsOn = localeWeekStartsOn == null ? 0 : toInteger(localeWeekStartsOn);
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var weekStartsOn = options.weekStartsOn == null ? defaultWeekStartsOn : toInteger(options.weekStartsOn); // Test if weekStartsOn is between 0 and 6 _and_ is not NaN
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if (!(weekStartsOn >= 0 && weekStartsOn <= 6)) {
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throw new RangeError('weekStartsOn must be between 0 and 6 inclusively');
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}
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var date = toDate(dirtyDate);
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var day = date.getUTCDay();
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var diff = (day < weekStartsOn ? 7 : 0) + day - weekStartsOn;
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date.setUTCDate(date.getUTCDate() - diff);
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date.setUTCHours(0, 0, 0, 0);
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return date;
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}
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