Using the phone : Adjusting the telephone settings : Date and time
Date and time
To ensure you have the correct time for incoming calls and to use the alarm clock and calendar, for example, the date and time must be set.
If the date and time have not yet been set on the handset, the display key Time appears.
*Press the display key Time
or
Set the date:
e. g.   for 14/01/2016
Set the time:
* Time    . . . use to enter hours and minutes in 4‑digit format e. g.  for 07:15 
Save settings:
*Save