javascript - Calculate last day of month

Question

If you provide 0 as the dayValue in Date.setFullYear you get the last day of the previous month:

d = new Date(); d.setFullYear(2008, 11, 0); //  Sun Nov 30 2008

There is reference to this behaviour at mozilla. Is this a reliable cross-browser feature or should I look at alternative methods?

Answer 1

var month = 0; // January
var d = new Date(2008, month + 1, 0);
console.log(d.toString()); // last day in January