Login to Webmail using the website link http://yourdomain.com/webmail or http://webmail.yourdomain.com
In sidebar, click on Settings
Click Preferences and then click User Interface
Select your time zone from the drop-down list and then click Save button
In sidebar, click on Settings
Click Preferences and then click User Interface
Select your time zone from the drop-down list and then click Save button
Updated on: 20 / 09 / 2021