Check Existing Date object is in UTC - Javascript

Question

I have used a Javascript function for converting date to UTC date as follows:

Date.prototype.convertToUTC = function () {
var month = this.getMonth();
var day = this.getDate();
var year = this.getFullYear();
return new Date(Date.UTC(year, month, day));
}

Now the problem arises when the date on which this function is applied is already in UTC. Since I don't know whether user will call this method on UTC/Local date, I want to ensure conversion happens only if it is not in UTC. Please help.

Answer 1

JavaScript Date object has the method getTimezoneOffset(). You could use that. Or use the getUTC* methods:

 var d = new Date();
 var utcyear = d.getUTCFullYear();