Have you showed up for a meeting an hour early since the time change on March 8? If so, you may have never set the proper timezone in your Google Calendar.
Here's how to do it:
From the Settings menu (1) select Settings(2).
Ensure that the Country is set to United States (1) and the time zone is set to Central Time (GMT-6:00) (2).
All done. Enjoy your extra hour of sleep.