33 lines
931 B
JavaScript
33 lines
931 B
JavaScript
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import toDate from '../toDate/index.js';
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/**
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* @name getDecade
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* @category Decade Helpers
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* @summary Get the decade of the given date.
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*
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* @description
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* Get the decade of the given date.
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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 given date
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* @returns {Number} the year of decade
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* @throws {TypeError} 1 argument required
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*
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* @example
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* // Which decade belongs 27 November 1942?
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* var result = getDecade(new Date(1942, 10, 27))
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* //=> 1940
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*/
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export default function getDecade(dirtyDate) {
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if (arguments.length < 1) {
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throw new TypeError('1 argument required, but only ' + arguments.length + ' present');
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}
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var date = toDate(dirtyDate);
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var year = date.getFullYear();
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var decade = Math.floor(year / 10) * 10;
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return decade;
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}
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