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It's important that the date and time are correct as some phone functions won't work. In most cases, date and time are set automatically but alternatively you can set them manually.
Slide your finger left on the display.
Turn on automatic date and time update
Press the indicator next to "Set automatically" until the function is turned on.
If you want to set the date time manually, you need turn off automatic date and time update and press the field below "Date" and the field below "Time". Follow the instructions on the display to set the date and time manually.
Return to the home screen
Press the Home key to return to the home screen.