In the old days, I had to wind my watch up each night, and every couple of months do a little fiddling to make sure the date indicator was current.
Today, I have to charge my watch up each night, and every couple of months do a little fiddling to make sure the firmware is current.
…plus c’est la même chose.
On the subject of watches, this very nice BBC article has a certain ‘back to the future’ quality:
http://m.bbc.co.uk/news/technology-31979004