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 王天杨
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import { constructFrom } from "./constructFrom.mjs";
import { getDaysInMonth } from "./getDaysInMonth.mjs";
import { toDate } from "./toDate.mjs";
/**
* @name setMonth
* @category Month Helpers
* @summary Set the month to the given date.
*
* @description
* Set the month to the given date.
*
* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
*
* @param date - The date to be changed
* @param month - The month index to set (0-11)
*
* @returns The new date with the month set
*
* @example
* // Set February to 1 September 2014:
* const result = setMonth(new Date(2014, 8, 1), 1)
* //=> Sat Feb 01 2014 00:00:00
*/
export function setMonth(date, month) {
const _date = toDate(date);
const year = _date.getFullYear();
const day = _date.getDate();
const dateWithDesiredMonth = constructFrom(date, 0);
dateWithDesiredMonth.setFullYear(year, month, 15);
dateWithDesiredMonth.setHours(0, 0, 0, 0);
const daysInMonth = getDaysInMonth(dateWithDesiredMonth);
// Set the last day of the new month
// if the original date was the last day of the longer month
_date.setMonth(month, Math.min(day, daysInMonth));
return _date;
}
// Fallback for modularized imports:
export default setMonth;
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