You MUST do it at the Main Extension handset - usually 101.
With the handset on the cradle:
Press Program button
Enter *#
Enter the system password - system default is 1234
Enter 000
Press the Auto Dial/Store button
Enter date using the Scroll button (the round one used for spkr volume) to move to right and left to next field
Press Auto Dial/Store button to accept setting
Press Redial button to move to time
Enter time using Scroll button (the round one used for spkr volume) to move to right and left to next field
Press Auto Dial/Store button to accept setting
Press Auto Ans/Mute to exit Date & Time
Press Program Button to complete
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