WHY DOES THE TIME ON MY PANASONIC KX-TG6641 PHONE ALWAYS MOVE AHEAD ONE HOUR AFTER I RESET THE TIME. USUALLY THE HOUR MOVES FORWARD A WHILE AFTER I PRESS SAVE?

SOURCE: Panasonic KX-TG2740 Cordless Phone - Can I reset handset registration

press function button on handset, scroll to initial setting, select by pressing right arrow, scroll to registration, select, select hs registration, follow directions on handset display, pressing mute on "new" base station, and ok on handset(plugged in). If you like, you can unregister with the "old" base unit first.

SOURCE: I am unable to change the time on my phone to reflect the day time savings

You will need to enter programming mode. Here are the directions.
You must be on the main phone on jack 01 to set time. You can determine if your phone is jack 01 by setting the switch on the end of a display phone to PROGRAM and then pushing the number 6 on the dial pad. The phone will read the jack and extension number. When you have determined the jack 01 phone, do the following.

1. Set switch on end of phone to "PROGRAM" (or push PROGRAM key if you have one)
2. Dial "0"
3. Enter year (last 2 digits)
4. Enter month (01-12)
5. Enter day (01-31)
6. Enter day of week (Sun 0, Mon 1, Tue 2, Wed 3, Thu 4, Fri 5, Sat 6.)
7. Enter Hour (01-12)
8. Enter Minute (00-59)
9. Press 0 for AM 1 for PM
10. Press "AUTO DIAL/STORE" key
11. Return phone switch to "SET" (or push PROGRAM key if you have one)

SOURCE: Panasonic KX-T7730 - changing time display

Following are the steps:-

PRESS: - PROGRAM (PITS PGM NO. APPEAR)
- *#1234
- 000
- Speaker (Date/Time will appear on the screen & blink
- Point directional sign to the desired position to change accordingly

Once finish with the above - Press "STORE" button
Then lift handset and replace

MT

SOURCE: How do I change the time on a KX-T7730 phone?

Basically, there are 2 ways of programming the date
and time - the short way and the long way.
If you are using the KX-T7730 phone on a Panasonic
KX-Txx 308/824 system:

SHORT WAY:
From the Switcboard / Main telephone
( ext 101, 10 or 9 ) with the handset on the
cradle/hook:
1. Press PROGRAM 0
2. Enter Date and Time
( The format is: yymmdd,
1 to 7 1=Monday 2=Tuesday etc, hh:mm,
0 or 1 0=AM 1=PM ) see example
3. Press AUTO DIAL / STORE to save your changes
4. Press PROGRAM to exit program mode

EXAMPLE:
If the date and time is 3 February 2010 Tuesday 2:15 pm you will enter as follows:
100203 2 02:15 1

LONG WAY:
From the Switcboard / Main telephone ( usually ext 101, 10 or 9 ) with the handset on the cradle/hook:
1. Press PROGRAM * # followed by the system
password ( default is 1234).
2. Now press 000 and then SP-PHONE.
Enter the year.
3. Scroll to the month with the right scroll key
(located at the right bottom corner of the phone).
To change the month use the AUTO ANS / MUTE
button.
4. Now scroll right again and change the date and
day.
To change the day, again use AUTO ANS / MUTE
5. Scroll right again and the time will appear.
Set the time.
To change am/pm scroll to it, and again,
use the AUTO ANS / MUTE button.
6. Press PROGRAM to exit program mode and you
are done.

SOURCE: Panasonic KX-TGA931T handset - How do I

press and keep "OFF" button until bip,
let it off and now u have NO New Voice Mail on yor screen