Normally, the time changes involved with Daylight Savings Time don't affect the game, because they occur overnight when most people aren't playing the game. If your game is off overnight (meaning that you have Quit the game), the clock will be adjusted before you start it back up in the morning, and there will simply be one more or one less hour since the game was last run.

The only time you have to be concerned about the time change is when you are actually running the game at the time the system clock is adjusted. It's best just to turn the game off (Quit) for the night twice a year when the DST changes occur.