index.js 1.6 KB

123456789101112131415161718192021222324252627282930313233343536373839404142
  1. "use strict";
  2. var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
  3. Object.defineProperty(exports, "__esModule", {
  4. value: true
  5. });
  6. exports.default = endOfISOWeekYear;
  7. var _index = _interopRequireDefault(require("../getISOWeekYear/index.js"));
  8. var _index2 = _interopRequireDefault(require("../startOfISOWeek/index.js"));
  9. var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
  10. /**
  11. * @name endOfISOWeekYear
  12. * @category ISO Week-Numbering Year Helpers
  13. * @summary Return the end of an ISO week-numbering year for the given date.
  14. *
  15. * @description
  16. * Return the end of an ISO week-numbering year,
  17. * which always starts 3 days before the year's first Thursday.
  18. * The result will be in the local timezone.
  19. *
  20. * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
  21. *
  22. * @param {Date|Number} date - the original date
  23. * @returns {Date} the end of an ISO week-numbering year
  24. * @throws {TypeError} 1 argument required
  25. *
  26. * @example
  27. * // The end of an ISO week-numbering year for 2 July 2005:
  28. * const result = endOfISOWeekYear(new Date(2005, 6, 2))
  29. * //=> Sun Jan 01 2006 23:59:59.999
  30. */
  31. function endOfISOWeekYear(dirtyDate) {
  32. (0, _index3.default)(1, arguments);
  33. var year = (0, _index.default)(dirtyDate);
  34. var fourthOfJanuaryOfNextYear = new Date(0);
  35. fourthOfJanuaryOfNextYear.setFullYear(year + 1, 0, 4);
  36. fourthOfJanuaryOfNextYear.setHours(0, 0, 0, 0);
  37. var date = (0, _index2.default)(fourthOfJanuaryOfNextYear);
  38. date.setMilliseconds(date.getMilliseconds() - 1);
  39. return date;
  40. }
  41. module.exports = exports.default;