setMonth() method of
Date instances changes the month and/or day of the month for this date according to local time.
setMonth(monthValue) setMonth(monthValue, dateValue)
An integer representing the month: 0 for January, 1 for February, and so on.
An integer from 1 to 31 representing the day of the month.
Date object in place, and returns its new timestamp. If a parameter is
NaN (or other values that get coerced to
NaN, such as
undefined), the date is set to Invalid Date and
NaN is returned.
If you do not specify the
dateValue parameter, the same value as what is returned by
getDate() is used.
If a parameter you specify is outside of the expected range, other parameters and the date information in the
Date object are updated accordingly. For example, if you specify 15 for
monthValue, the year is incremented by 1, and 3 is used for month.
The current day of month will have an impact on the behavior of this method. Conceptually it will add the number of days given by the current day of the month to the 1st day of the new month specified as the parameter, to return the new date. For example, if the current value is 31st January 2016, calling setMonth with a value of 1 will return 2nd March 2016. This is because in 2016 February had 29 days.
const theBigDay = new Date(); theBigDay.setMonth(6); //Watch out for end of month transitions const endOfMonth = new Date(2016, 7, 31); endOfMonth.setMonth(1); console.log(endOfMonth); //Wed Mar 02 2016 00:00:00
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