Daylight! lets you configure the scheme for Daylight Saving Time adjustments so you don't have to manually reset your Mac's clock twice a year.
Just set the scheme for the starting and ending dates of Daylight Saving Time with the Control Panel, and Daylight! will automatically calculate the dates and "spring forward" or "fall back" for you.
Daylight! makes its adjustments at 2:00 AM. If your Mac is running at that time, you will get an optional alert telling you that the time has changed. If your Mac is not running at that time, the adjustment will be made the next time your Mac starts up.