How to get last day of the month

Question

How can I obtain the last day of the month with the timestamp being 11:59:59 PM?

Answer 1

var month = 1; // 1 for January
var d = new Date(2015, month, 0);
console.log(d); // last day in January

Answer 2

Last day of the month

now = new Date
lastDayOfTheMonth = new Date(1900+now.getYear(), now.getMonth()+1, 0)

Answer 3

var d = new Date();
console.log(d);
d.setMonth(d.getMonth() + 1); // set month as next month
console.log(d);
d.setDate(0); // get the last day of previous month
console.log(d);

Here is output from the code above:
Thu Oct 03 2013 11:34:59 GMT+0100 (GMT Daylight Time)
Sun Nov 03 2013 11:34:59 GMT+0000 (GMT Standard Time)
Thu Oct 31 2013 11:34:59 GMT+0000 (GMT Standard Time)