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 ?

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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.)