Since daylight savings time came a few weeks earlier than usual, most Garmin GPS Systems are still are an hour off. If you want your gps system to show the correct time, then you’ll have to do a software update to get your gps back on track. Garmin released some software updates for their systems which you can find here. You can also manually change the time, here’s a link to Garmin User Manuals. Another way to update the time on your gps system, is to run the Garmin WebUpdate program with your gps device connected to your computer.
Gps Magazine, have done a great job of listing a gps unit and its time status. They also provide links to the latest software updates for each gps system.