Squiggle, I hope your boiler clock did change automatically as doiing it yourself means reading the manual and trying to work out what to do, If you have to stop the cuckoo clock for an hour what do you do when it's time to move forward an hour without being driven mad?
The one timer which I haven't changed yet is the one for my telephone. It automatically changes when someone rings me and I ring my brother and ask him to ring me back.