index.js 873 B

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  1. import toDate from "../toDate/index.js";
  2. import requiredArgs from "../_lib/requiredArgs/index.js";
  3. /**
  4. * @name lastDayOfYear
  5. * @category Year Helpers
  6. * @summary Return the last day of a year for the given date.
  7. *
  8. * @description
  9. * Return the last day of a year for the given date.
  10. * The result will be in the local timezone.
  11. *
  12. * @param {Date|Number} date - the original date
  13. * @returns {Date} the last day of a year
  14. * @throws {TypeError} 1 argument required
  15. *
  16. * @example
  17. * // The last day of a year for 2 September 2014 11:55:00:
  18. * const result = lastDayOfYear(new Date(2014, 8, 2, 11, 55, 00))
  19. * //=> Wed Dec 31 2014 00:00:00
  20. */
  21. export default function lastDayOfYear(dirtyDate) {
  22. requiredArgs(1, arguments);
  23. var date = toDate(dirtyDate);
  24. var year = date.getFullYear();
  25. date.setFullYear(year + 1, 0, 0);
  26. date.setHours(0, 0, 0, 0);
  27. return date;
  28. }