36 lines
1.1 KiB
JavaScript
36 lines
1.1 KiB
JavaScript
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import { toDate } from "./toDate.mjs";
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/**
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* @name endOfDecade
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* @category Decade Helpers
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* @summary Return the end of a decade for the given date.
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*
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* @description
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* Return the end of a decade for the given date.
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*
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* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
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*
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* @param date - The original date
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*
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* @returns The end of a decade
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*
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* @example
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* // The end of a decade for 12 May 1984 00:00:00:
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* const result = endOfDecade(new Date(1984, 4, 12, 00, 00, 00))
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* //=> Dec 31 1989 23:59:59.999
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*/
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export function endOfDecade(date) {
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// TODO: Switch to more technical definition in of decades that start with 1
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// end with 0. I.e. 2001-2010 instead of current 2000-2009. It's a breaking
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// change, so it can only be done in 4.0.
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const _date = toDate(date);
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const year = _date.getFullYear();
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const decade = 9 + Math.floor(year / 10) * 10;
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_date.setFullYear(decade, 11, 31);
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_date.setHours(23, 59, 59, 999);
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return _date;
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}
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// Fallback for modularized imports:
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export default endOfDecade;
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