AASTRA DT4x2 for BusinessPhone User Guide EN - Manual (Page 100)

Settings
BusinessPhone – Cordless DT412/DT422/DT432 100
Clock settings
If the clock and date is set, you can on the same day a call is
received, see the time for it.
Set the clock to get the time automatically from the
system
When you have entered settings: á
Select General . ã
Select Clock . á
Press. â
or
ã
Select Auto setting .
Select Press (see display).
Auto setting
is shown.
Set the clock manually
When you have entered settings: á
Select General . ã
Select Clock . á
Press. â
or
ã
Select Manual setting .
Select Press (see display). å
Enter time, year, month, and day according to the example
below.
Example: Time:0815, Year:2003, Month:05, Day:12.
Save Press (see display).
The setting is saved.