Sony A57 - Manual (Page 28)

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Turning the camera on and setting the clock
To cancel the date/time setting operation
Press the MENU button.
To set up the date/time again
When you turn the camera on for the first time, the date/time setup screen
appears automatically. The next time, set up the date and time from the
menu.
MENU button t 1 t [Date/Time Setup]
To set up the area again
You can set the area where you are using the camera. This allows you to set
the local area when you use the camera abroad.
MENU button t 1 t [Area Setting]
Maintaining the date and time setting
This camera has an internal rechargeable battery for maintaining the date
and time and other settings regardless of whether the power is on or off, or
the battery is installed or not (page 201).
5 Repeat step 4 to set other items, then press the center
of the control button.
6 Verify that [Enter] is selected, then press the center of
the control button.