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javascriptdatesubtraction

Subtracting 1 month to 2015-12-31 gives 2015-12-01

I'm trying to subtract one month from 2015-12-31 but it gives me 2015-12-01 instead of 2015-11-30. Why ?

Code:

var date1 = new Date('2015-12-31');
var date2 = new Date(date1);

date2.setMonth(date1.getMonth() - 1);
console.log(date1);
console.log(date2);

Output:

Thu Dec 31 2015 01:00:00 GMT+0100 (CET)
Tue Dec 01 2015 01:00:00 GMT+0100 (CET)

Any workaround?

Solution

  • Try this

    var date1 = new Date('2015-12-31');
var date2 = new Date(date1);
date2.setDate(date2.getDate()-date1.getDate()); 
alert(date2)