Question

My fiddle here is returning 0 for December

https://jsfiddle.net/3CpXz/

var exploded = "2011-12-25".split('-');
var d = new Date(exploded[0], exploded[1], exploded[2]);
document.write("year"+d.getUTCFullYear()+ " month"+d.getUTCMonth()+" day"+d.getUTCDate());

Why is this?

Answer 1

No, this is the other way around: you are defining date as if it was in January.

See the documentation on Date():

month – Integer value representing the month, beginning with 0 for January to 11 for December.

You provided 12, so it was treated as 0 (January).

If you need a proof, see modified version of the script, showing the whole date and time.