設定

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WEBSITE_TIME_ZONE　を Tokyo Standard Timeに設定します。

確認

アプリケーションを該当サーバーにあげて、local で時間が取得できるように下記のコードを用意。
（CLからたたいたほうが簡単かも)

[HttpGet("/DateTimeNow")]
[ProducesResponseType(201)]
public ActionResult GetServerTime()
{
  return Ok(DateTime.Now);
}

サーバーにて確認

ちゃんと日本時間になっていました。

他の時間

他の時間帯に設定したいときは下記の値を参照ください。

Value="Morocco Standard Time" For (GMT) Casablanca
Value="GMT Standard Time" For (GMT) Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London
Value="Greenwich Standard Time" For (GMT) Monrovia, Reykjavik
Value="W. Europe Standard Time" For (GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna
Value="Central Europe Standard Time" For (GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague
Value="Romance Standard Time" For (GMT+01:00) Brussels, Copenhagen, Madrid, Paris
Value="Central European Standard Time" For (GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb
Value="W. Central Africa Standard Time" For (GMT+01:00) West Central Africa
Value="Jordan Standard Time" For (GMT+02:00) Amman
Value="GTB Standard Time" For (GMT+02:00) Athens, Bucharest, Istanbul
Value="Middle East Standard Time" For (GMT+02:00) Beirut
Value="Egypt Standard Time" For (GMT+02:00) Cairo
Value="South Africa Standard Time" For (GMT+02:00) Harare, Pretoria
Value="FLE Standard Time" For (GMT+02:00) Helsinki, Kyiv, Riga, Sofia, Tallinn, Vilnius
Value="Israel Standard Time" For (GMT+02:00) Jerusalem
Value="E. Europe Standard Time" For (GMT+02:00) Minsk
Value="Namibia Standard Time" For (GMT+02:00) Windhoek
Value="Arabic Standard Time" For (GMT+03:00) Baghdad
Value="Arab Standard Time" For (GMT+03:00) Kuwait, Riyadh
Value="Russian Standard Time" For (GMT+03:00) Moscow, St. Petersburg, Volgograd
Value="E. Africa Standard Time" For (GMT+03:00) Nairobi
Value="Georgian Standard Time" For (GMT+03:00) Tbilisi
Value="Iran Standard Time" For (GMT+03:30) Tehran
Value="Arabian Standard Time" For (GMT+04:00) Abu Dhabi, Muscat
Value="Azerbaijan Standard Time" For (GMT+04:00) Baku
Value="Mauritius Standard Time" For (GMT+04:00) Port Louis
Value="Caucasus Standard Time" For (GMT+04:00) Yerevan
Value="Afghanistan Standard Time" For (GMT+04:30) Kabul
Value="Ekaterinburg Standard Time" For (GMT+05:00) Ekaterinburg
Value="Pakistan Standard Time" For (GMT+05:00) Islamabad, Karachi
Value="West Asia Standard Time" For (GMT+05:00) Tashkent
Value="India Standard Time" For (GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi
Value="Sri Lanka Standard Time" For (GMT+05:30) Sri Jayawardenepura
Value="Nepal Standard Time" For (GMT+05:45) Kathmandu
Value="N. Central Asia Standard Time" For (GMT+06:00) Almaty, Novosibirsk
Value="Central Asia Standard Time" For (GMT+06:00) Astana, Dhaka
Value="Myanmar Standard Time" For (GMT+06:30) Yangon (Rangoon)
Value="SE Asia Standard Time" For (GMT+07:00) Bangkok, Hanoi, Jakarta
Value="North Asia Standard Time" For (GMT+07:00) Krasnoyarsk
Value="China Standard Time" For (GMT+08:00) Beijing, Chongqing, Hong Kong, Urumqi
Value="North Asia East Standard Time" For (GMT+08:00) Irkutsk, Ulaan Bataar
Value="Singapore Standard Time" For (GMT+08:00) Kuala Lumpur, Singapore
Value="W. Australia Standard Time" For (GMT+08:00) Perth
Value="Taipei Standard Time" For (GMT+08:00) Taipei
Value="Tokyo Standard Time" For (GMT+09:00) Osaka, Sapporo, Tokyo
Value="Korea Standard Time" For (GMT+09:00) Seoul
Value="Yakutsk Standard Time" For (GMT+09:00) Yakutsk
Value="Cen. Australia Standard Time" For (GMT+09:30) Adelaide
Value="AUS Central Standard Time" For (GMT+09:30) Darwin
Value="E. Australia Standard Time" For (GMT+10:00) Brisbane
Value="AUS Eastern Standard Time" For (GMT+10:00) Canberra, Melbourne, Sydney
Value="West Pacific Standard Time" For (GMT+10:00) Guam, Port Moresby
Value="Tasmania Standard Time" For (GMT+10:00) Hobart
Value="Vladivostok Standard Time" For (GMT+10:00) Vladivostok
Value="Central Pacific Standard Time" For (GMT+11:00) Magadan, Solomon Is., New Caledonia
Value="New Zealand Standard Time" For (GMT+12:00) Auckland, Wellington
Value="Fiji Standard Time" For (GMT+12:00) Fiji, Kamchatka, Marshall Is.
Value="Tonga Standard Time" For (GMT+13:00) Nuku'alofa
Value="Azores Standard Time" For (GMT-01:00) Azores
Value="Cape Verde Standard Time" For (GMT-01:00) Cape Verde Is.
Value="Mid-Atlantic Standard Time" For (GMT-02:00) Mid-Atlantic
Value="E. South America Standard Time" For (GMT-03:00) Brasilia
Value="Argentina Standard Time" For (GMT-03:00) Buenos Aires
Value="SA Eastern Standard Time" For (GMT-03:00) Georgetown
Value="Greenland Standard Time" For (GMT-03:00) Greenland
Value="Montevideo Standard Time" For (GMT-03:00) Montevideo
Value="Newfoundland Standard Time" For (GMT-03:30) Newfoundland
Value="Atlantic Standard Time" For (GMT-04:00) Atlantic Time (Canada)
Value="SA Western Standard Time" For (GMT-04:00) La Paz
Value="Central Brazilian Standard Time" For (GMT-04:00) Manaus
Value="Pacific SA Standard Time" For (GMT-04:00) Santiago
Value="Venezuela Standard Time" For (GMT-04:30) Caracas
Value="SA Pacific Standard Time" For (GMT-05:00) Bogota, Lima, Quito, Rio Branco
Value="Eastern Standard Time" For (GMT-05:00) Eastern Time (US & Canada)
Value="US Eastern Standard Time" For (GMT-05:00) Indiana (East)
Value="Central America Standard Time" For (GMT-06:00) Central America
Value="Central Standard Time" For (GMT-06:00) Central Time (US & Canada)
Value="Central Standard Time (Mexico)" For (GMT-06:00) Guadalajara, Mexico City,Monterrey
Value="Canada Central Standard Time" For (GMT-06:00) Saskatchewan
Value="US Mountain Standard Time" For (GMT-07:00) Arizona
Value="Mountain Standard Time (Mexico)" For (GMT-07:00) Chihuahua, La Paz, Mazatlan
Value="Mountain Standard Time" For (GMT-07:00) Mountain Time (US & Canada)
Value="Pacific Standard Time" For (GMT-08:00) Pacific Time (US & Canada)
Value="Pacific Standard Time (Mexico)" For (GMT-08:00) Tijuana, Baja California
Value="Alaskan Standard Time" For (GMT-09:00) Alaska
Value="Hawaiian Standard Time" For (GMT-10:00) Hawaii
Value="Samoa Standard Time" For (GMT-11:00) Midway Island, Samoa
Value="Dateline Standard Time" For (GMT-12:00) International Date Line West

[Azure] Web App 日本時間に設定をする

設定

確認

他の時間