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You can adjust the time zone of all three webmail clients provided by default on all XonHost servers.
In SquirrelMail you can change Time zone settings from Options -> Personal Information -> Timezone Optionsand then click the Submit button.
In Horde the Time zone can be altered via Preferences -> Global Preferences -> Locale and Time. Choose the desired Time zone from the drop down menu then click the Save button.
In order to change the Time zone in RoundCube go to Settings -> Preferences -> User Interface and select the desired Time zone from the drop down menu. Then click the Save button.