Coordinated Universal Time (UTC) is a high-precision, atomic time standard. The world’s time zones are expressed as positive or negative offsets from UTC. Thus, UTC provides a kind of time-zone free or time-zone neutral time. The use of UTC time is recommended when a date and time's portability across computers is important. (For details and other best practices using dates and times, see Coding Best Practices Using DateTime in the .NET Framework.) Converting individual time zones to UTC makes time comparisons easy.
VB.NET
Dim dateNow As Date = Date.Now
Console.WriteLine("The date and time are {0} UTC.",TimeZoneInfo.ConvertTimeToUtc(dateNow))
C#.NET
DateTime dateNow = DateTime.Now;
Console.WriteLine("The date and time are {0} UTC.", TimeZoneInfo.ConvertTimeToUtc(dateNow));
If the date and time value does not represent either the local time or UTC, the ToUniversalTime method will likely return an erroneous result. However, you can use the TimeZoneInfo.ConvertTimeToUtc method to convert the date and time from a specified time zone. (For details on retrieving a TimeZoneInfo object that represents the destination time zone, see Finding the Time Zones Defined on a Local System.) The following code uses the TimeZoneInfo.ConvertTimeToUtc method to convert Eastern Standard Time to UTC.VB.NET
Dim easternTime As New Date(2007, 01, 02, 12, 16, 00)
Dim easternZoneId As String = "Eastern Standard Time"
Try
Dim easternZone As TimeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById(easternZoneId)
Console.WriteLine("The date and time are {0} UTC.", TimeZoneInfo.ConvertTimeToUtc(easternTime, easternZone))
Catch e As TimeZoneNotFoundException
Console.WriteLine("Unable to find the {0} zone in the registry.",easternZoneId)
Catch e As InvalidTimeZoneException
Console.WriteLine("Registry data on the {0} zone has been corrupted.",easternZoneId)
End Try
C#.NET
DateTime easternTime = new DateTime(2007, 01, 02, 12, 16, 00);
string easternZoneId = "Eastern Standard Time";
try
{
TimeZoneInfo easternZone = TimeZoneInfo.FindSystemTimeZoneById(easternZoneId);
Console.WriteLine("The date and time are {0} UTC.",TimeZoneInfo.ConvertTimeToUtc(easternTime, easternZone));
}
catch (TimeZoneNotFoundException)
{
Console.WriteLine("Unable to find the {0} zone in the registry.",easternZoneId);
}
catch (InvalidTimeZoneException)
{
Console.WriteLine("Registry data on the {0} zone has been corrupted.", easternZoneId);
}
Time Zone IDs (Compact 2013)
The Dynamic Daylight Savings Time (Dynamic DST) feature provides the following time zone IDs.ID Time zone name Time Difference Display string 0 Dateline Standard Time (UTC-12:00) International Date Line West 110 UTC-11 (UTC-11:00) Coordinated Universal Time -11 200 Hawaiian Standard Time (UTC-10:00) Hawaii 300 Alaskan Standard Time (UTC-09:00) Alaska 400 Pacific Standard Time (UTC-08:00) Pacific Time (US and Canada) 410 Pacific Standard Time (Mexico) (UTC-08:00) Baja California 500 Mountain Standard Time (UTC-07:00) Mountain Time (US and Canada) 510 Mountain Standard Time (Mexico) (UTC-07:00) Chihuahua, La Paz, Mazatlan 520 US Mountain Standard Time (UTC-07:00) Arizona 600 Canada Central Standard Time (UTC-06:00) Saskatchewan 610 Central America Standard Time (UTC-06:00) Central America 620 Central Standard Time (UTC-06:00) Central Time (US and Canada) 630 Central Standard Time (Mexico) (UTC-06:00) Guadalajara, Mexico City, Monterrey 700 Eastern Standard Time (UTC-05:00) Eastern Time (US and Canada) 710 SA Pacific Standard Time (UTC-05:00) Bogota, Lima, Quito 720 US Eastern Standard Time (UTC-05:00) Indiana (East) 840 Venezuela Standard Time (UTC-04:30) Caracas 800 Atlantic Standard Time (UTC-04:00) Atlantic Time (Canada) 810 Central Brazilian Standard Time (UTC-04:00) Cuiaba 820 Pacific SA Standard Time (UTC-04:00) Santiago 830 SA Western Standard Time (UTC-04:00) Georgetown, La Paz, Manaus, San Juan 850 Paraguay Standard Time (UTC-04:00) Asuncion 900 Newfoundland Standard Time (UTC-03:30) Newfoundland 910 E. South America Standard Time (UTC-03:00) Brasilia 920 Greenland Standard Time (UTC-03:00) Greenland 930 Montevideo Standard Time (UTC-03:00) Montevideo 940 SA Eastern Standard Time (UTC-03:00) Cayenne, Fortaleza 950 Argentina Standard Time (UTC-03:00) Buenos Aires 1000 Mid-Atlantic Standard Time (UTC-02:00) Mid-Atlantic 1010 UTC-2 (UTC-02:00) Coordinated Universal Time -02 1100 Azores Standard Time (UTC-01:00) Azores 1110 Cape Verde Standard Time (UTC-01:00) Cape Verde Is. 1200 GMT Standard Time (UTC) Dublin, Edinburgh, Lisbon, London 1210 Greenwich Standard Time (UTC) Monrovia, Reykjavik 1220 Morocco Standard Time (UTC) Casablanca 1230 UTC (UTC) Coordinated Universal Time 1300 Central Europe Standard Time (UTC+01:00) Belgrade, Bratislava, Budapest, Ljubljana, 1310 Central European Standard Time (UTC+01:00) Sarajevo, Skopje, Warsaw, Zagreb 1320 Romance Standard Time (UTC+01:00) Brussels, Copenhagen, Madrid, Paris 1330 W. Central Africa Standard Time (UTC+01:00) West Central Africa 1340 W. Europe Standard Time (UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna 1350 Namibia Standard Time (UTC+01:00) Windhoek 1400 E. Europe Standard Time (UTC+02:00) Minsk 1410 Egypt Standard Time (UTC+02:00) Cairo 1420 FLE Standard Time (UTC+02:00) Helsinki, Kyiv, Riga, Sofia, Tallinn, Vilnius 1430 GTB Standard Time (UTC+02:00) Athens, Bucharest 1440 Israel Standard Time (UTC+02:00) Jerusalem 1450 Jordan Standard Time (UTC+02:00) Amman 1460 Middle East Standard Time (UTC+02:00) Beirut 1470 South Africa Standard Time (UTC+02:00) Harare, Pretoria 1480 Syria Standard Time (UTC+02:00) Damascus 1490 Turkey Standard Time (UTC+02:00) Istanbul 1500 Arab Standard Time (UTC+03:00) Kuwait, Riyadh 1510 Arabic Standard Time (UTC+03:00) Baghdad 1520 E. Africa Standard Time (UTC+03:00) Nairobi 1530 Kaliningrad Standard Time (UTC+03:00) Kaliningrad 1550 Iran Standard Time (UTC+03:30) Tehran 1540 Russian Standard Time (UTC+04:00) Moscow, St. Petersburg, Volgograd 1600 Arabian Standard Time (UTC+04:00) Abu Dhabi, Muscat 1610 Azerbaijan Standard Time (UTC+04:00) Baku 1620 Caucasus Standard Time (UTC+04:00) Yerevan 1640 Georgian Standard Time (UTC+04:00) Tbilisi 1650 Mauritius Standard Time (UTC+04:00) Port Louis 1630 Afghanistan Standard Time (UTC+04:30) Kabul 1710 West Asia Standard Time (UTC+05:00) Tashkent 1750 Pakistan Standard Time (UTC+05:00) Islamabad, Karachi 1720 India Standard Time (UTC+05:30) Chennai, Kolkata, Mumbai, New Delhi 1730 Sri Lanka Standard Time (UTC+05:30) Sri Jayawardenepura 1740 Nepal Standard Time (UTC+05:45) Kathmandu 1700 Ekaterinburg Standard Time (UTC+06:00) Ekaterinburg 1800 Central Asia Standard Time (UTC+06:00) Astana 1830 Bangladesh Standard Time (UTC+06:00) Dhaka 1820 Myanmar Standard Time (UTC+06:30) Yangon (Rangoon) 1810 N. Central Asia Standard Time (UTC+07:00) Novosibirsk 1910 SE Asia Standard Time (UTC+07:00) Bangkok, Hanoi, Jakarta 1900 North Asia Standard Time (UTC+08:00) Krasnoyarsk 2000 China Standard Time (UTC+08:00) Beijing, Chongqing, Hong Kong, Urumqi 2020 Singapore Standard Time (UTC+08:00) Kuala Lumpur, Singapore 2030 Taipei Standard Time (UTC+08:00) Taipei 2040 W. Australia Standard Time (UTC+08:00) Perth 2050 Ulaanbaatar Standard Time (UTC+08:00) Ulaanbaatar 2010 North Asia East Standard Time (UTC+09:00) Irkutsk 2100 Korea Standard Time (UTC+09:00) Seoul 2110 Tokyo Standard Time (UTC+09:00) Osaka, Sapporo, Tokyo 2130 AUS Central Standard Time (UTC+09:30) Darwin 2140 Cen. Australia Standard Time (UTC+09:30) Adelaide 2120 Yakutsk Standard Time (UTC+10:00) Yakutsk 2200 AUS Eastern Standard Time (UTC+10:00) Canberra, Melbourne, Sydney 2210 E. Australia Standard Time (UTC+10:00) Brisbane 2220 Tasmania Standard Time (UTC+10:00) Hobart 2240 West Pacific Standard Time (UTC+10:00) Guam, Port Moresby 2230 Vladivostok Standard Time (UTC+11:00) Vladivostok 2300 Central Pacific Standard Time (UTC+11:00) Solomon Is., New Caledonia 2310 Magadan Standard Time (UTC+12:00) Magadan 2400 Fiji Standard Time (UTC+12:00) Fiji 2410 New Zealand Standard Time (UTC+12:00) Auckland, Wellington 2430 UTC+12 (UTC+12:00) Coordinated Universal Time +12 2500 Tonga Standard Time (UTC+13:00) Nuku'alofa 2510 Samoa Standard Time (UTC-11:00) Samoa
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