Get Web Browser TimeZone

Is there a simple way to get a client's timezone from the web browser?

Re: Get Web Browser TimeZone

I have a solution but it is ugly because it has many lines of code, however I will end up moving the values to a database in the future. Below is the ugly solution:

function pageLoad() {

if (document.getElementById('<%=hasTimeZoneHiddenField.ClientID %>').value == 'false') {

var timeSummer = new Date(Date.UTC(2005, 6, 30, 0, 0, 0, 0));

var summerOffset = -1 * timeSummer.getTimezoneOffset();

var timeWinter = new Date(Date.UTC(2005, 12, 30, 0, 0, 0, 0));

var winterOffset = -1 * timeWinter.getTimezoneOffset();

var timeZoneHiddenField = document.getElementById('<%=timeZoneHiddenField.ClientID %>');

if (-720 == summerOffset && -720 == winterOffset) { timeZoneHiddenField.value = 'Dateline Standard Time'; }

else if (-660 == summerOffset && -660 == winterOffset) { timeZoneHiddenField.value = 'UTC-11'; }

else if (-660 == summerOffset && -660 == winterOffset) { timeZoneHiddenField.value = 'Samoa Standard Time'; }

else if (-660 == summerOffset && -600 == winterOffset) { timeZoneHiddenField.value = 'Hawaiian Standard Time'; }

else if (-570 == summerOffset && -570 == winterOffset) { timeZoneHiddenField.value = 'Pacific/Marquesas'; }

// else if (-540 == summerOffset && -600 == winterOffset) { timeZoneHiddenField.value = 'America/Adak'; }

// else if (-540 == summerOffset && -540 == winterOffset) { timeZoneHiddenField.value = 'Pacific/Gambier'; }

else if (-480 == summerOffset && -540 == winterOffset) { timeZoneHiddenField.value = 'Alaskan Standard Time'; }

// else if (-480 == summerOffset && -480 == winterOffset) { timeZoneHiddenField.value = 'Pacific/Pitcairn'; }

else if (-420 == summerOffset && -480 == winterOffset) { timeZoneHiddenField.value = 'Pacific Standard Time'; }

else if (-420 == summerOffset && -420 == winterOffset) { timeZoneHiddenField.value = 'US Mountain Standard Time'; }

else if (-360 == summerOffset && -420 == winterOffset) { timeZoneHiddenField.value = 'Mountain Standard Time'; }

else if (-360 == summerOffset && -360 == winterOffset) { timeZoneHiddenField.value = 'Central America Standard Time'; }

// else if (-360 == summerOffset && -300 == winterOffset) { timeZoneHiddenField.value = 'Pacific/Easter'; }

else if (-300 == summerOffset && -360 == winterOffset) { timeZoneHiddenField.value = 'Central Standard Time'; }

else if (-300 == summerOffset && -300 == winterOffset) { timeZoneHiddenField.value = 'SA Pacific Standard Time'; }

else if (-240 == summerOffset && -300 == winterOffset) { timeZoneHiddenField.value = 'Eastern Standard Time'; }

else if (-270 == summerOffset && -270 == winterOffset) { timeZoneHiddenField.value = 'Venezuela Standard Time'; }

else if (-240 == summerOffset && -240 == winterOffset) { timeZoneHiddenField.value = 'SA Western Standard Time'; }

else if (-240 == summerOffset && -180 == winterOffset) { timeZoneHiddenField.value = 'Central Brazilian Standard Time'; }

else if (-180 == summerOffset && -240 == winterOffset) { timeZoneHiddenField.value = 'Atlantic Standard Time'; }

else if (-180 == summerOffset && -180 == winterOffset) { timeZoneHiddenField.value = 'Montevideo Standard Time'; }

else if (-180 == summerOffset && -120 == winterOffset) { timeZoneHiddenField.value = 'E. South America Standard Time'; }

else if (-150 == summerOffset && -210 == winterOffset) { timeZoneHiddenField.value = 'Mid-Atlantic Standard Time'; }

else if (-120 == summerOffset && -180 == winterOffset) { timeZoneHiddenField.value = 'America/Godthab'; }

else if (-120 == summerOffset && -120 == winterOffset) { timeZoneHiddenField.value = 'SA Eastern Standard Time'; }

else if (-60 == summerOffset && -60 == winterOffset) { timeZoneHiddenField.value = 'Cape Verde Standard Time'; }

else if (0 == summerOffset && -60 == winterOffset) { timeZoneHiddenField.value = 'Azores Daylight Time'; }

else if (0 == summerOffset && 0 == winterOffset) { timeZoneHiddenField.value = 'Morocco Standard Time'; }

else if (60 == summerOffset && 0 == winterOffset) { timeZoneHiddenField.value = 'GMT Standard Time'; }

else if (60 == summerOffset && 60 == winterOffset) { timeZoneHiddenField.value = 'Africa/Algiers'; }

else if (60 == summerOffset && 120 == winterOffset) { timeZoneHiddenField.value = 'Namibia Standard Time'; }

else if (120 == summerOffset && 60 == winterOffset) { timeZoneHiddenField.value = 'Central European Standard Time'; }

else if (120 == summerOffset && 120 == winterOffset) { timeZoneHiddenField.value = 'South Africa Standard Time'; }

else if (180 == summerOffset && 120 == winterOffset) { timeZoneHiddenField.value = 'GTB Standard Time'; }

else if (180 == summerOffset && 180 == winterOffset) { timeZoneHiddenField.value = 'E. Africa Standard Time'; }

else if (240 == summerOffset && 180 == winterOffset) { timeZoneHiddenField.value = 'Russian Standard Time'; }

else if (240 == summerOffset && 240 == winterOffset) { timeZoneHiddenField.value = 'Arabian Standard Time'; }

else if (270 == summerOffset && 210 == winterOffset) { timeZoneHiddenField.value = 'Iran Standard Time'; }

else if (270 == summerOffset && 270 == winterOffset) { timeZoneHiddenField.value = 'Afghanistan Standard Time'; }

else if (300 == summerOffset && 240 == winterOffset) { timeZoneHiddenField.value = 'Pakistan Standard Time'; }

else if (300 == summerOffset && 300 == winterOffset) { timeZoneHiddenField.value = 'West Asia Standard Time'; }

else if (330 == summerOffset && 330 == winterOffset) { timeZoneHiddenField.value = 'India Standard Time'; }

else if (345 == summerOffset && 345 == winterOffset) { timeZoneHiddenField.value = 'Nepal Standard Time'; }

else if (360 == summerOffset && 300 == winterOffset) { timeZoneHiddenField.value = 'N. Central Asia Standard Time'; }

else if (360 == summerOffset && 360 == winterOffset) { timeZoneHiddenField.value = 'Central Asia Standard Time'; }

else if (390 == summerOffset && 390 == winterOffset) { timeZoneHiddenField.value = 'Myanmar Standard Time'; }

else if (420 == summerOffset && 360 == winterOffset) { timeZoneHiddenField.value = 'North Asia Standard Time'; }

else if (420 == summerOffset && 420 == winterOffset) { timeZoneHiddenField.value = 'SE Asia Standard Time'; }

else if (480 == summerOffset && 420 == winterOffset) { timeZoneHiddenField.value = 'North Asia East Standard Time'; }

else if (480 == summerOffset && 480 == winterOffset) { timeZoneHiddenField.value = 'China Standard Time'; }

else if (540 == summerOffset && 480 == winterOffset) { timeZoneHiddenField.value = 'Yakutsk Standard Time'; }

else if (540 == summerOffset && 540 == winterOffset) { timeZoneHiddenField.value = 'Tokyo Standard Time'; }

else if (570 == summerOffset && 570 == winterOffset) { timeZoneHiddenField.value = 'Cen. Australia Standard Time'; }

else if (570 == summerOffset && 630 == winterOffset) { timeZoneHiddenField.value = 'Australia/Adelaide'; }

else if (600 == summerOffset && 540 == winterOffset) { timeZoneHiddenField.value = 'Asia/Yakutsk'; }

else if (600 == summerOffset && 600 == winterOffset) { timeZoneHiddenField.value = 'E. Australia Standard Time'; }

else if (600 == summerOffset && 660 == winterOffset) { timeZoneHiddenField.value = 'AUS Eastern Standard Time'; }

else if (630 == summerOffset && 660 == winterOffset) { timeZoneHiddenField.value = 'Australia/Lord_Howe'; }

else if (660 == summerOffset && 600 == winterOffset) { timeZoneHiddenField.value = 'Tasmania Standard Time'; }

else if (660 == summerOffset && 660 == winterOffset) { timeZoneHiddenField.value = 'West Pacific Standard Time'; }

else if (690 == summerOffset && 690 == winterOffset) { timeZoneHiddenField.value = 'Central Pacific Standard Time'; }

else if (720 == summerOffset && 660 == winterOffset) { timeZoneHiddenField.value = 'Magadan Standard Time'; }

else if (720 == summerOffset && 720 == winterOffset) { timeZoneHiddenField.value = 'Fiji Standard Time'; }

else if (720 == summerOffset && 780 == winterOffset) { timeZoneHiddenField.value = 'New Zealand Standard Time'; }

else if (765 == summerOffset && 825 == winterOffset) { timeZoneHiddenField.value = 'Pacific/Chatham'; }

else if (780 == summerOffset && 780 == winterOffset) { timeZoneHiddenField.value = 'Tonga Standard Time'; }

else if (840 == summerOffset && 840 == winterOffset) { timeZoneHiddenField.value = 'Pacific/Kiritimati'; }

else { timeZoneHiddenField.value = 'US/Pacific'; }

__doPostBack('<%=PostBackUpdatePanel.ClientID %>');

}

</script>