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- import toDate from "../toDate/index.js";
- import requiredArgs from "../_lib/requiredArgs/index.js";
- /**
- * @name getDaysInMonth
- * @category Month Helpers
- * @summary Get the number of days in a month of the given date.
- *
- * @description
- * Get the number of days in a month of the given date.
- *
- * @param {Date|Number} date - the given date
- * @returns {Number} the number of days in a month
- * @throws {TypeError} 1 argument required
- *
- * @example
- * // How many days are in February 2000?
- * const result = getDaysInMonth(new Date(2000, 1))
- * //=> 29
- */
- export default function getDaysInMonth(dirtyDate) {
- requiredArgs(1, arguments);
- var date = toDate(dirtyDate);
- var year = date.getFullYear();
- var monthIndex = date.getMonth();
- var lastDayOfMonth = new Date(0);
- lastDayOfMonth.setFullYear(year, monthIndex + 1, 0);
- lastDayOfMonth.setHours(0, 0, 0, 0);
- return lastDayOfMonth.getDate();
- }
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