Are you looking for ubuntu change time, for how to change the time in Ubuntu permanently, as changing it through the panel in desktop just gets changed temporarily, and reverts back after reboot.
Ubuntu Change Time, Ubuntu Set Time
To change and set the time in Ubuntu permanently, just follow the steps below:
System -> Administration -> Time and Date
A popup window will appear with title Time and Date Settings.
If the Time and Date Settings window is disabled, then click on the mid bottom lock button between Help and Close buttons. Click on the lock button, and give your Ubuntu login password and this is it.
Now you may be able to change and set your Ubuntu Time settings permanently.