Normally every user need to set the default language and time zone when loggin into OWA in Office365.
It’s possible to set the language and time zone for every Office365 user.For this we need to use the Set-MailboxRegionalConfiguration cmdlet in PowerShell. Once we’ve connected to Office 365 using Powershell, we only need to run one cmdlet.
get-mailbox | Set-MailboxRegionalConfiguration -Language -TimeZone
In the Example below we will set all mailboxes in our Office365 Tenant to the Language Dutch English (UK) and the West Europe Standard Time Zone (GMT +1).
get-mailbox | Set-MailboxRegionalConfiguration -Language 1043 -TimeZone "W. Europe Standard Time"
If you want to reset the Time Zone settings for All Users:Get-Mailbox | Set-Mailbox -Languages $null
The Language ID is a number that corresponds to the correct language type. The following table shows you which number corresponds to which language.
| Language (Locale) | Code |
|---|---|
| Arabic (Algeria) | 5121 |
| Arabic (Bahrain) | 15361 |
| Arabic (Egypt) | 3073 |
| Arabic (Iraq) | 2049 |
| Arabic (Jordan) | 11265 |
| Arabic (Kuwait) | 13313 |
| Arabic (Lebanon) | 12289 |
| Arabic (Libya) | 4097 |
| Arabic (Morocco) | 6145 |
| Arabic (Oman) | 8193 |
| Arabic (Qatar) | 16385 |
| Arabic (Saudi Arabia) | 1025 |
| Arabic (Syria) | 10241 |
| Arabic (Tunisia) | 7169 |
| Arabic (U.A.E.) | 14337 |
| Arabic (Yemen) | 9217 |
| Basque | 1069 |
| Bulgarian | 1026 |
| Catalan | 1027 |
| Chinese (Hong Kong S.A.R) | 3076 |
| Chinese (Macau S.A.R) | 5124 |
| Chinese (People’s Republic of China) | 2052 |
| Chinese (Singapore) | 4100 |
| Chinese (Taiwan) | 1028 |
| Croatian | 1050 |
| Czech | 1029 |
| Danish | 1030 |
| Dutch (Belgium) | 2067 |
| Dutch (Netherlands) | 1043 |
| English (Australia) | 3081 |
| English (Belize) | 10249 |
| English (Canada) | 4105 |
| English (Caribbean) | 9225 |
| English (Ireland) | 6153 |
| English (Jamaica) | 8201 |
| English (New Zealand) | 5129 |
| English (Republic of the Philippines) | 13321 |
| English (South Africa) | 7177 |
| English (Trinidad) | 11273 |
| English (United Kingdom) | 2057 |
| English (United States) | 1033 |
| English (Zimbabwe) | 12297 |
| Estonian | 1061 |
| Filipino (Philippines) | 1124 |
| Finnish | 1035 |
| French (Belgium) | 2060 |
| French (Canada) | 3084 |
| French (France) | 1036 |
| French (Luxembourg) | 5132 |
| French (Principality of Monaco) | 6156 |
| French (Switzerland) | 4108 |
| German (Austria) | 3079 |
| German (Germany) | 1031 |
| German (Liechtenstein) | 5127 |
| German (Luxembourg) | 4103 |
| German (Switzerland) | 2055 |
| Greek | 1032 |
| Hebrew | 1037 |
| Hindi | 1081 |
| Hungarian | 1038 |
| Icelandic | 1039 |
| Indonesian | 1057 |
| Italian (Italy) | 1040 |
| Italian (Switzerland) | 2064 |
| Japanese | 1041 |
| Kazakh | 1087 |
| Korean | 1042 |
| Latvian | 1062 |
| Lithuanian | 1063 |
| Malay | 1086 |
| Norwegian (Bokmål) | 1044 |
| Persian | 1065 |
| Polish | 1045 |
| Portuguese (Brazil) | 1046 |
| Portuguese (Portugal) | 2070 |
| Romanian | 1048 |
| Russian | 1049 |
| Serbian (Cyrillic) | 3098 |
| Serbian (Latin) | 2074 |
| Slovak | 1051 |
| Slovenian | 1060 |
| Spanish (Argentina) | 11274 |
| Spanish (Bolivia) | 16394 |
| Spanish (Chile) | 13322 |
| Spanish (Colombia) | 9226 |
| Spanish (Costa Rica) | 5130 |
| Spanish (Dominican Republic) | 7178 |
| Spanish (Ecuador) | 12298 |
| Spanish (El Salvador) | 17418 |
| Spanish (Guatemala) | 4106 |
| Spanish (Honduras) | 18442 |
| Spanish (Mexico) | 2058 |
| Spanish (Nicaragua) | 19466 |
| Spanish (Panama) | 6154 |
| Spanish (Paraguay) | 15370 |
| Spanish (Peru) | 10250 |
| Spanish (Puerto Rico) | 20490 |
| Spanish (International Sort) | 3082 |
| Spanish (Traditional Sort) | 1034 |
| Spanish (Uruguay) | 14346 |
| Spanish (Venezuela) | 8202 |
| Swedish (Finland) | 2077 |
| Swedish (Sweden) | 1053 |
| Thai | 1054 |
| Turkish | 1055 |
| Ukrainian | 1058 |
| Urdu | 1056 |
| Vietnamese | 1066 |
The TimeZone consists of a String representing the time zone. Use the value from the middle column of the table below:
| Index | Name of Time Zone | Time |
| 000 | Dateline Standard Time | (GMT-12:00) International Date Line West |
| 001 | Samoa Standard Time | (GMT-11:00) Midway Island, Samoa |
| 002 | Hawaiian Standard Time | (GMT-10:00) Hawaii |
| 003 | Alaskan Standard Time | (GMT-09:00) Alaska |
| 004 | Pacific Standard Time | (GMT-08:00) Pacific Time (US and Canada); Tijuana |
| 010 | Mountain Standard Time | (GMT-07:00) Mountain Time (US and Canada) |
| 013 | Mexico Standard Time 2 | (GMT-07:00) Chihuahua, La Paz, Mazatlan |
| 015 | U.S. Mountain Standard Time | (GMT-07:00) Arizona |
| 020 | Central Standard Time | (GMT-06:00) Central Time (US and Canada |
| 025 | Canada Central Standard Time | (GMT-06:00) Saskatchewan |
| 030 | Mexico Standard Time | (GMT-06:00) Guadalajara, Mexico City, Monterrey |
| 033 | Central America Standard Time | (GMT-06:00) Central America |
| 035 | Eastern Standard Time | (GMT-05:00) Eastern Time (US and Canada) |
| 040 | U.S. Eastern Standard Time | (GMT-05:00) Indiana (East) |
| 045 | S.A. Pacific Standard Time | (GMT-05:00) Bogota, Lima, Quito |
| 050 | Atlantic Standard Time | (GMT-04:00) Atlantic Time (Canada) |
| 055 | S.A. Western Standard Time | (GMT-04:00) Caracas, La Paz |
| 056 | Pacific S.A. Standard Time | (GMT-04:00) Santiago |
| 060 | Newfoundland and Labrador Standard Time | (GMT-03:30) Newfoundland and Labrador |
| 065 | E. South America Standard Time | (GMT-03:00) Brasilia |
| 070 | S.A. Eastern Standard Time | (GMT-03:00) Buenos Aires, Georgetown |
| 073 | Greenland Standard Time | (GMT-03:00) Greenland |
| 075 | Mid-Atlantic Standard Time | (GMT-02:00) Mid-Atlantic |
| 080 | Azores Standard Time | (GMT-01:00) Azores |
| 083 | Cape Verde Standard Time | (GMT-01:00) Cape Verde Islands |
| 085 | GMT Standard Time | (GMT) Greenwich Mean Time: Dublin, Edinburgh, Lisbon, London |
| 090 | Greenwich Standard Time | (GMT) Casablanca, Monrovia |
| 095 | Central Europe Standard Time | (GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague |
| 100 | Central European Standard Time | (GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb |
| 105 | Romance Standard Time | (GMT+01:00) Brussels, Copenhagen, Madrid, Paris |
| 110 | W. Europe Standard Time | (GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna |
| 113 | W. Central Africa Standard Time | (GMT+01:00) West Central Africa |
| 115 | E. Europe Standard Time | (GMT+02:00) Bucharest |
| 120 | Egypt Standard Time | (GMT+02:00) Cairo |
| 125 | FLE Standard Time | (GMT+02:00) Helsinki, Kiev, Riga, Sofia, Tallinn, Vilnius |
| 130 | GTB Standard Time | (GMT+02:00) Athens, Istanbul, Minsk |
| 135 | Israel Standard Time | (GMT+02:00) Jerusalem |
| 140 | South Africa Standard Time | (GMT+02:00) Harare, Pretoria |
| 145 | Russian Standard Time | (GMT+03:00) Moscow, St. Petersburg, Volgograd |
| 150 | Arab Standard Time | (GMT+03:00) Kuwait, Riyadh |
| 155 | E. Africa Standard Time | (GMT+03:00) Nairobi |
| 158 | Arabic Standard Time | (GMT+03:00) Baghdad |
| 160 | Iran Standard Time | (GMT+03:30) Tehran |
| 165 | Arabian Standard Time | (GMT+04:00) Abu Dhabi, Muscat |
| 170 | Caucasus Standard Time | (GMT+04:00) Baku, Tbilisi, Yerevan |
| 175 | Transitional Islamic State of Afghanistan Standard Time | (GMT+04:30) Kabul |
| 180 | Ekaterinburg Standard Time | (GMT+05:00) Ekaterinburg |
| 185 | West Asia Standard Time | (GMT+05:00) Islamabad, Karachi, Tashkent |
| 190 | India Standard Time | (GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi |
| 193 | Nepal Standard Time | (GMT+05:45) Kathmandu |
| 195 | Central Asia Standard Time | (GMT+06:00) Astana, Dhaka |
| 200 | Sri Lanka Standard Time | (GMT+06:00) Sri Jayawardenepura |
| 201 | N. Central Asia Standard Time | (GMT+06:00) Almaty, Novosibirsk |
| 203 | Myanmar Standard Time | (GMT+06:30) Yangon Rangoon |
| 205 | S.E. Asia Standard Time | (GMT+07:00) Bangkok, Hanoi, Jakarta |
| 207 | North Asia Standard Time | (GMT+07:00) Krasnoyarsk |
| 210 | China Standard Time | (GMT+08:00) Beijing, Chongqing, Hong Kong SAR, Urumqi |
| 215 | Singapore Standard Time | (GMT+08:00) Kuala Lumpur, Singapore |
| 220 | Taipei Standard Time | (GMT+08:00) Taipei |
| 225 | W. Australia Standard Time | (GMT+08:00) Perth |
| 227 | North Asia East Standard Time | (GMT+08:00) Irkutsk, Ulaanbaatar |
| 230 | Korea Standard Time | (GMT+09:00) Seoul |
| 235 | Tokyo Standard Time | (GMT+09:00) Osaka, Sapporo, Tokyo |
| 240 | Yakutsk Standard Time | (GMT+09:00) Yakutsk |
| 245 | A.U.S. Central Standard Time | (GMT+09:30) Darwin |
| 250 | Cen. Australia Standard Time | (GMT+09:30) Adelaide |
| 255 | A.U.S. Eastern Standard Time | (GMT+10:00) Canberra, Melbourne, Sydney |
| 260 | E. Australia Standard Time | (GMT+10:00) Brisbane |
| 265 | Tasmania Standard Time | (GMT+10:00) Hobart |
| 270 | Vladivostok Standard Time | (GMT+10:00) Vladivostok |
| 275 | West Pacific Standard Time | (GMT+10:00) Guam, Port Moresby |
| 280 | Central Pacific Standard Time | (GMT+11:00) Magadan, Solomon Islands, New Caledonia |
| 285 | Fiji Islands Standard Time | (GMT+12:00) Fiji Islands, Kamchatka, Marshall Islands |
| 290 | New Zealand Standard Time | (GMT+12:00) Auckland, Wellington |
| 300 | Tonga Standard Time | (GMT+13:00) Nuku’alofa |