Hello & Welcome to Just Answer,
Sorry to hear of any issue you may be having with your phones.
May I ask if you have a DIFFERENT phone number from where the Panasonic system is connected (such as a cell phone) - where I can call you and walk you through the time and date setting?
Please let me know here.
I see it has been a few days and I haven't seen a response on this page, so I just wanted to follow up to see if you have any more questions concerning this issue OR if the issue was resolved?
I look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)