index.js 895 B

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  1. import toDate from "../toDate/index.js";
  2. import requiredArgs from "../_lib/requiredArgs/index.js";
  3. /**
  4. * @name lastDayOfDecade
  5. * @category Decade Helpers
  6. * @summary Return the last day of a decade for the given date.
  7. *
  8. * @description
  9. * Return the last day of a decade for the given date.
  10. *
  11. * @param {Date|Number} date - the original date
  12. * @returns {Date} the last day of a decade
  13. * @throws {TypeError} 1 argument required
  14. *
  15. * @example
  16. * // The last day of a decade for 21 December 2012 21:12:00:
  17. * const result = lastDayOfDecade(new Date(2012, 11, 21, 21, 12, 00))
  18. * //=> Wed Dec 31 2019 00:00:00
  19. */
  20. export default function lastDayOfDecade(dirtyDate) {
  21. requiredArgs(1, arguments);
  22. var date = toDate(dirtyDate);
  23. var year = date.getFullYear();
  24. var decade = 9 + Math.floor(year / 10) * 10;
  25. date.setFullYear(decade + 1, 0, 0);
  26. date.setHours(0, 0, 0, 0);
  27. return date;
  28. }