Anonymous posted an answer for this Panasonic KX-T7730 Corded Phone:
"You need to have the main phone, 1. Press the programme button 2. then *#1234 3. 000 4...."
Anonymous posted a question about Panasonic KX-T7735 Corded Phone:
"how do you change the time on these phones. the user manual is of no help with this."