Can I get the browser time zone in ASP.NET or do I have to rely on JS operations to retrieve the information?

Question

Can I get the browser time zone in ASP.NET or do I have to rely on JS operations to retrieve the information

Answer 1

There is no “Accept-Timezone” header (or the like) - the HTTP standard does not contain any facility to allow the browser to automatically tell the server what time zone the user cares about.

The basic approach is to use a date and read the TZ info from it.

Since there's no standard (cross-browser time zone naming functions - you have to resort to something like (yikes!):

function getTimezoneName() {     tmSummer = new Date(Date.UTC(2005, 6, 30, 0, 0, 0, 0));     so = -1 * tmSummer.getTimezoneOffset();     tmWinter = new Date(Date.UTC(2005, 12, 30, 0, 0, 0, 0));     wo = -1 * tmWinter.getTimezoneOffset();      if (-660 == so && -660 == wo) return 'Pacific/Midway';     if (-600 == so && -600 == wo) return 'Pacific/Tahiti';     if (-570 == so && -570 == wo) return 'Pacific/Marquesas';     if (-540 == so && -600 == wo) return 'America/Adak';     if (-540 == so && -540 == wo) return 'Pacific/Gambier';     if (-480 == so && -540 == wo) return 'US/Alaska';     if (-480 == so && -480 == wo) return 'Pacific/Pitcairn';     if (-420 == so && -480 == wo) return 'US/Pacific';     if (-420 == so && -420 == wo) return 'US/Arizona';     if (-360 == so && -420 == wo) return 'US/Mountain';     if (-360 == so && -360 == wo) return 'America/Guatemala';     if (-360 == so && -300 == wo) return 'Pacific/Easter';     if (-300 == so && -360 == wo) return 'US/Central';     if (-300 == so && -300 == wo) return 'America/Bogota';     if (-240 == so && -300 == wo) return 'US/Eastern';     if (-240 == so && -240 == wo) return 'America/Caracas';     if (-240 == so && -180 == wo) return 'America/Santiago';     if (-180 == so && -240 == wo) return 'Canada/Atlantic';     if (-180 == so && -180 == wo) return 'America/Montevideo';     if (-180 == so && -120 == wo) return 'America/Sao_Paulo';     if (-150 == so && -210 == wo) return 'America/St_Johns';     if (-120 == so && -180 == wo) return 'America/Godthab';     if (-120 == so && -120 == wo) return 'America/Noronha';     if (-60 == so && -60 == wo) return 'Atlantic/Cape_Verde';     if (0 == so && -60 == wo) return 'Atlantic/Azores';     if (0 == so && 0 == wo) return 'Africa/Casablanca';     if (60 == so && 0 == wo) return 'Europe/London';     if (60 == so && 60 == wo) return 'Africa/Algiers';     if (60 == so && 120 == wo) return 'Africa/Windhoek';     if (120 == so && 60 == wo) return 'Europe/Amsterdam';     if (120 == so && 120 == wo) return 'Africa/Harare';     if (180 == so && 120 == wo) return 'Europe/Athens';     if (180 == so && 180 == wo) return 'Africa/Nairobi';     if (240 == so && 180 == wo) return 'Europe/Moscow';     if (240 == so && 240 == wo) return 'Asia/Dubai';     if (270 == so && 210 == wo) return 'Asia/Tehran';     if (270 == so && 270 == wo) return 'Asia/Kabul';     if (300 == so && 240 == wo) return 'Asia/Baku';     if (300 == so && 300 == wo) return 'Asia/Karachi';     if (330 == so && 330 == wo) return 'Asia/Calcutta';     if (345 == so && 345 == wo) return 'Asia/Katmandu';     if (360 == so && 300 == wo) return 'Asia/Yekaterinburg';     if (360 == so && 360 == wo) return 'Asia/Colombo';     if (390 == so && 390 == wo) return 'Asia/Rangoon';     if (420 == so && 360 == wo) return 'Asia/Almaty';     if (420 == so && 420 == wo) return 'Asia/Bangkok';     if (480 == so && 420 == wo) return 'Asia/Krasnoyarsk';     if (480 == so && 480 == wo) return 'Australia/Perth';     if (540 == so && 480 == wo) return 'Asia/Irkutsk';     if (540 == so && 540 == wo) return 'Asia/Tokyo';     if (570 == so && 570 == wo) return 'Australia/Darwin';     if (570 == so && 630 == wo) return 'Australia/Adelaide';     if (600 == so && 540 == wo) return 'Asia/Yakutsk';     if (600 == so && 600 == wo) return 'Australia/Brisbane';     if (600 == so && 660 == wo) return 'Australia/Sydney';     if (630 == so && 660 == wo) return 'Australia/Lord_Howe';     if (660 == so && 600 == wo) return 'Asia/Vladivostok';     if (660 == so && 660 == wo) return 'Pacific/Guadalcanal';     if (690 == so && 690 == wo) return 'Pacific/Norfolk';     if (720 == so && 660 == wo) return 'Asia/Magadan';     if (720 == so && 720 == wo) return 'Pacific/Fiji';     if (720 == so && 780 == wo) return 'Pacific/Auckland';     if (765 == so && 825 == wo) return 'Pacific/Chatham';     if (780 == so && 780 == wo) return 'Pacific/Enderbury'     if (840 == so && 840 == wo) return 'Pacific/Kiritimati';     return 'US/Pacific'; }