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This repository has been archived by the owner on Mar 22, 2022. It is now read-only.
import toInteger from '../_lib/toInteger/index.ts'
import toDate from '../toDate/index.ts'
import requiredArgs from '../_lib/requiredArgs/index.ts'
/**
* @name addDays
* @category Day Helpers
* @summary Add the specified number of days to the given date.
*
* @description
* Add the specified number of days to the given date.
*
* ### v2.0.0 breaking changes:
*
* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
*
* @param {Date|Number} date - the date to be changed
* @param {Number} amount - the amount of days to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
* @returns {Date} - the new date with the days added
* @throws {TypeError} - 2 arguments required
*
* @example
* // Add 10 days to 1 September 2014:
* const result = addDays(new Date(2014, 8, 1), 10)
* //=> Thu Sep 11 2014 00:00:00
*/
export default function addDays(
dirtyDate: Date | number,
dirtyAmount: number
): Date {
requiredArgs(2, arguments)
const date = toDate(dirtyDate)
const amount = toInteger(dirtyAmount)
if (isNaN(amount)) {
return new Date(NaN)
}
if (!amount) {
// If 0 days, no-op to avoid changing times in the hour before end of DST