index.js 1.2 KB

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  1. "use strict";
  2. var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
  3. Object.defineProperty(exports, "__esModule", {
  4. value: true
  5. });
  6. exports.default = getDaysInMonth;
  7. var _index = _interopRequireDefault(require("../toDate/index.js"));
  8. var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
  9. /**
  10. * @name getDaysInMonth
  11. * @category Month Helpers
  12. * @summary Get the number of days in a month of the given date.
  13. *
  14. * @description
  15. * Get the number of days in a month of the given date.
  16. *
  17. * @param {Date|Number} date - the given date
  18. * @returns {Number} the number of days in a month
  19. * @throws {TypeError} 1 argument required
  20. *
  21. * @example
  22. * // How many days are in February 2000?
  23. * const result = getDaysInMonth(new Date(2000, 1))
  24. * //=> 29
  25. */
  26. function getDaysInMonth(dirtyDate) {
  27. (0, _index2.default)(1, arguments);
  28. var date = (0, _index.default)(dirtyDate);
  29. var year = date.getFullYear();
  30. var monthIndex = date.getMonth();
  31. var lastDayOfMonth = new Date(0);
  32. lastDayOfMonth.setFullYear(year, monthIndex + 1, 0);
  33. lastDayOfMonth.setHours(0, 0, 0, 0);
  34. return lastDayOfMonth.getDate();
  35. }
  36. module.exports = exports.default;