None. My cell phone and computer are automatic. I have several clocks in the house set to 1 hour behind; and several set to the present hour. Due to doing this for several years, I know which set of clocks to look at at which time of year. When someone asks me what time it is, I look at the nearest clock and know, due to the time of year, whether it is the *current* time, or one hour behind. I know.. silly... but it's just a pain to do this twice a year!
CG