My parents are having a problem setting the date and time on their BT 7610 handset system - since the clocks changed for DST.
Using the menu to get to date/time allows them to change the time, and then when trying to change the date it displays as 126/00/201 and then changes to 12/00/0000. When they try to enter a new date - for example 04 / 04 / 2016 it does not allow the second '4' digit to be entered.
After this neither the date nor time is changed.
Any help would be appreciated.
Though this will be of no use to you now, since so much time has passed, but for future visitors:
Take the batteries out of the handset, put them back in, and during the auto setup it will ask you to enter the time and date. It will work during this initial setup but not afterwards.
Even a factory reset won't achieve same, you have to take out the batteries.