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- import toDate from "../toDate/index.js";
- import requiredArgs from "../_lib/requiredArgs/index.js";
- /**
- * @name lastDayOfDecade
- * @category Decade Helpers
- * @summary Return the last day of a decade for the given date.
- *
- * @description
- * Return the last day of a decade for the given date.
- *
- * @param {Date|Number} date - the original date
- * @returns {Date} the last day of a decade
- * @throws {TypeError} 1 argument required
- *
- * @example
- * // The last day of a decade for 21 December 2012 21:12:00:
- * const result = lastDayOfDecade(new Date(2012, 11, 21, 21, 12, 00))
- * //=> Wed Dec 31 2019 00:00:00
- */
- export default function lastDayOfDecade(dirtyDate) {
- requiredArgs(1, arguments);
- var date = toDate(dirtyDate);
- var year = date.getFullYear();
- var decade = 9 + Math.floor(year / 10) * 10;
- date.setFullYear(decade + 1, 0, 0);
- date.setHours(0, 0, 0, 0);
- return date;
- }
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