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Viewing file:     index.js (1.02 KB)      -rw-r--r--

import toDate from "../toDate/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
/**
 * @name startOfDecade
 * @category Decade Helpers
 * @summary Return the start of a decade for the given date.
 *
 * @description
 * Return the start of a decade for the given date.
 *
 * ### v2.0.0 breaking changes:
 *
 * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
 *
 * @param {Date|Number} date - the original date
 * @returns {Date} the start of a decade
 * @throws {TypeError} 1 argument required
 *
 * @example
 * // The start of a decade for 21 October 2015 00:00:00:
 * const result = startOfDecade(new Date(2015, 9, 21, 00, 00, 00))
 * //=> Jan 01 2010 00:00:00
 */

export default function startOfDecade(dirtyDate) {
  requiredArgs(1, arguments);
  var date = toDate(dirtyDate);
  var year = date.getFullYear();
  var decade = Math.floor(year / 10) * 10;
  date.setFullYear(decade, 0, 1);
  date.setHours(0, 0, 0, 0);
  return date;
}