<script type="text/javascript">
        $(document).ready(function () {
            $("#btnGo").click(function () {

                var objdatetime = new Date();
                var timezone = objdatetime.toTimeString();
                var tzstr = timezone.split("(");
                var timezoneid = tzstr[1].toString().replace(")", "");
                alert(timezoneid);
                return false;
            });
        });
    </script>

var zoneId = "India Standard Time";
    DateTimeZone _zone = DateTimeZoneProviders.Tzdb[zoneId];
    ZonedDateTime _now = SystemClock.Instance.Now.InZone(_zone);
   string xx= now.ToLongTimeString();