I also thought about getting this to drive a clock and be very hands off, and for me that means adjusting for DST so once set I shouldn't have to touch it. I've written code that barely fits into an ATMEGA8 that adjusts automatically for DST in the US...granted that you can't set the time w/the code, the 1307 has to already have your standard time in it, but it's pretty neat I think nonetheless. Of course you could just use a in input and flip a switch to tell the arduino to adjust or not, but this is all in software and automagic.