Follow the instructions listed below. You shouldn't have any problems

Step 1
Press the FEATURE key followed by **8463
Password Retry Step 2
Press 266344 on the dial pad buttons to enter the DEFAULT password. Your password MAY BE DIFFERENT! The display will show the following options:
Hour: 01 Next Change Step 3
Select CHANGE - the display will show the following options:
Hour: __ Cancl Step 4
Use the dial pad buttons to enter the hour. You must use two digits for all hours (i.e. "08" for 8 o'clock). You will be prompted to enter AM or PM. Select CHANGE and OK to choose PM. AM OK Change Step 5
After you have entered the hours, select NEXT. The display will show minutes as 00. Use the dial pad buttons to enter the minutes. If you are just changing the time, press the RELEASE (RLS) button to end your session. The time will be changed and the date will remain the same.
If you want to change the date, select NEXT.
Minutes: 00 Next Change Step 6
The display will show 99 as the year. Using two digits, enter the year using the dial pad buttons (i.e. "05" for 2005).
Select NEXT, and repeat to change the month and the day.

Year: 99 Next Change Step 7
Once you have entered the day, press the RELEASE (RLS) key to end your session. This will save the changed time and date