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 d = new Date();
m = d.getMonth(); //current month
y = d.getFullYear(); //current year
alert(new Date(y,m,1)); //this is first day of current month
alert(new Date(y,m+1,0)); //this is last day of current month