Panasonic KX-TA624 / KX-TA824 
(using KX-T7030 or KX-T7031 telephones)
Changing the time on a Panasonic KX-TA624 system must be done from
extension # 101 using a display phone.
1.    Move MEMORY switch on rear from SET to PROGRAM
2.    Dial *#1234
3.    Dial 000 
4.    Press NEXT ("Sp-phone") 
5.    Press Right Arrow ("FWD/DND") four times until you see the time
       displayed 
6.    Move MEMORY switch on rear from PROGRAM to SET
7.    Press Right Arrow ("FWD/DND") to reach the minutes field 
8.    Change minutes with the keypad, if necessary
 
9.    Press AUTO DIAL/STORE 
10.  Press HOLD 
11.  Change the hour with the keypad