var now = new Date();
    var nowSecs = now.valueOf();
    var nowUtc = new Date(now.getTime() + (now.getTimezoneOffset() * 60000));
    var nowUtcSecs = nowUtc.valueOf();
    var exp: any = Date.parse(expirationDate);
    var expSecs = exp.valueOf();

    var diffSecs = (expSecs - nowUtcSecs) / 1000;
    var diffMins = diffSecs / 60;

console.log(expirationDate)
VM2717:1 Fri, 27 Mar 2015 11:11:44 GMT

console.log(nowUtc)
VM2796:1 Fri Mar 27 2015 11:32:42 GMT+0700 (SE Asia Standard Time)

console.log (diffMins)
VM2943:1 399.0280166666667