javascript conversion string to UTC date -

i'm converting string timestamp using

 var  timestamp = new date(month+"/"+day+"/"+year).gettime()/ 1000; 

my question how set utc timezone before converting timestamp ?

use date.utc() method instead of .gettime().

var timestamp = date.utc(year,month,day) / 1000; 

(note: month expected 0-11, not 1-12.)