Since your ADT Home Alarm System is a security system, you must have the master code or the installer code to make any adjustments, including setting the time. If you do not have a security code or installer code, you will have to contact your dealer. To change the time, your system must be disarmed and have no faults present. Time setting is done at the master keypad.
Setting the Time
Enter the four-digit master code or installer code + FUNCTION + 63. The display will show the currently set hour and indicate AM or PM.
On the keypad, enter two digits for the hour, using "0" for the first digit when appropriate. The display will show your entry.
Press the asterisk [ * ] to accept the setting and continue, or press the pound sign [ # ] to reset the hour.
Press the "1" key to enter PM or the "0" key to enter AM.
Press the asterisk to accept the setting and continue, or press the pound sign to reset the AM/PM function.
Enter two digits for the minute. The display will show your entry.
Press the asterisk to accept the setting and continue, or press the pound sign to reset the minute function.
At this point the control panel will continue for month, day and year information. You can continue setting them in the same manner or simply press the asterisk key three times to accept all settings.