Hello & Welcome to Just Answer,
I have attached the instructions - as an image - that show how to set the date and time for this system
I also have a link to a video that shows the steps for setting the DATE and TIME for similar Panasonic systems.
NOTE: The handset in the video may not match your system exactly, but the steps are the same.
Please let me know if that works for you or if you have any more questions.
If this has helped answer your question(s), please take a moment to rate MY service level (5-star is my goal) so that I get credit for my time helping you with this question.You should see some "stars" (and SUBMIT button) to do that, but please let me know if you do NOT see them (you may have to REFRESH your screen) or can not use them.
Thanks, ***** *****--. .-