How to add months to a date in JavaScript

Question

I want to add months to a date in JavaScript   For example  I am inserting date 06 01 2011  format mm dd yyyy  and now I want to add 8 months to this date  I want the result to be 02 01 2012   So when adding months  the year may also increase

User · Accepted Answer

Corrected as of 25 06 2019   var newDate   new Date date setMonth date getMonth   8      Old From here   var jan312009   new Date 2009  0  31   var eightMonthsFromJan312009    jan312009 setMonth jan312009 getMonth   8

User · Answer

I would highly recommend taking a look at datejs  With it s api  it becomes drop dead simple to add a month  and lots of other date functionality    var one month from your date   your date object add 1  month      What s nice about datejs is that it handles edge cases  because technically you can do this using the native Date object and it s attached methods  But you end up pulling your hair out over edge cases  which datejs has taken care of for you    Plus it s open source

User · Answer

I took a look at the datejs and stripped out the code necessary to add months to a date handling edge cases  leap year  shorter months  etc    Date isLeapYear   function  year         return    year   4     0   amp  amp   year   100     0       year   400     0         Date getDaysInMonth   function  year  month        return  31   Date isLeapYear year    29   28   31  30  31  30  31  31  30  31  30  31  month       Date prototype isLeapYear   function           return Date isLeapYear this getFullYear          Date prototype getDaysInMonth   function           return Date getDaysInMonth this getFullYear    this getMonth         Date prototype addMonths   function  value        var n   this getDate        this setDate 1       this setMonth this getMonth     value       this setDate Math min n  this getDaysInMonth          return this       This will add  addMonths    function to any javascript date object that should handle edge cases  Thanks to Coolite Inc   Use    var myDate   new Date  01 31 2012    var result1   myDate addMonths 1    var myDate2   new Date  01 31 2011    var result2   myDate2 addMonths 1     -    newDate addMonths -  mydate addMonths  result1    Feb 29 2012   result2    Feb 28 2011

User · Answer

Split your date into year  month  and day components then use Date   var d   new Date year  month  day   d setMonth d getMonth     8     Date will take care of fixing the year

[javascript] How to add months to a date in JavaScript?

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