javascript conversion string to UTC date

I'm converting string to timestamp by using

 var  timestamp = new Date(month+"/"+day+"/"+year).getTime()/ 1000;

My question is how to set it as UTC timezone before converting to tim开发者_开发问答estamp ?

Use the Date.UTC() method instead of .getTime().

var timestamp = Date.UTC(year,month,day) / 1000;

(Note: the month is expected to be from 0-11, not 1-12.)