Panasonic VA-12020 Operating Instructions Manual page 31

When you are not using the telephone, the display indicates the time. When you are
making a call, it shows the telephone number you are dialing. During a call it indicates the
length of time for the conversation.
In addition,
alarm setting or a stored number can be shown on the. display for
confirmation.
The display shows a number of up to 12 digits For a number of more than 12 digits, it
shows the number sequentially until it is displaying the last 12 digits.
Setting time (from extension 10 only)
Hours and minutes are entered each in two digits.
Example: Setting for 2:30 pm
1. Press ON/OFF key
2. Press dial keys * 5
3. Enter hour (0 2) from 01 to 12
4. Enter minutes (3 0) from 00 to 59
5. Enter either am or pm (2)
1 for AM, 2 for PM
6. Press dial key # for storing
7. Press ON/OFF key