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33 lines
1.0 KiB
33 lines
1.0 KiB
import toDate from '../toDate/index.js';
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import requiredArgs from '../_lib/requiredArgs/index.js';
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/**
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* @name startOfYear
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* @category Year Helpers
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* @summary Return the start of a year for the given date.
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*
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* @description
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* Return the start of a year for the given date.
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* The result will be in the local timezone.
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*
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* ### v2.0.0 breaking changes:
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*
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* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
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*
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* @param {Date|Number} date - the original date
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* @returns {Date} the start of a year
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* @throws {TypeError} 1 argument required
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*
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* @example
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* // The start of a year for 2 September 2014 11:55:00:
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* var result = startOfYear(new Date(2014, 8, 2, 11, 55, 00))
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* //=> Wed Jan 01 2014 00:00:00
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*/
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export default function startOfYear(dirtyDate) {
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requiredArgs(1, arguments);
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var cleanDate = toDate(dirtyDate);
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var date = new Date(0);
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date.setFullYear(cleanDate.getFullYear(), 0, 1);
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date.setHours(0, 0, 0, 0);
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return date;
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} |