Need to reset time ,day and date

Setting the Clock
You’ll need to set the clock so that it can
announce the day and time that each
message is received. Press Play/stop to exit
Setting the Clock at any time.
1 Press and hold Clock until the
Message Window displays C, and the
default day is announced.
2 To change the day setting, hold down memo/repeat
or ANNC/Skip until the
correct day is announced. Then
release the button.
3 Press and release Clock. The current
hour setting is announced.
4 To change the hour setting, hold down memo/repeat
or ANNC/Skip until the
correct hour is announced. Then
release the button.
5 Press and release Clock. The current
minutes setting is announced.
6 To change the minutes setting, hold
down memo/repeat or ANNC/skip until the
correct minutes setting is announced.
Then release the button.
7 Press and release C. The new day
and time are announced.
To check the clock, press and release
Clock.
NOTE: In the event of a power failure,
see the instructions on the bottom of the
unit to reset the clock.
Record a memo /
Repeat all or part of a message


I hope this helps! here is the URL to the information provided

http://telephones.att.com/docMgt/public/art/162/1717_manual.pdf