You can control this on your user control panel. Near the top of the page is the black bar, first link on the left should read "User CP". Click that. Then in the list of links on the left side of the screen there's "Edit Options". When you go to that page, about 3/4 of the way down is the box for date and time adjustments. You can choose your time zone, and how you want the system to deal with DST.
If the problem is the settings on your computer just click the time display on lower right (most PCs), that will open a screen to adjust date and time settings.