Most user settings can be changed in the User Control Panel, link at the upper left just below the CDM logo.
To set the correct time for your time zone:
While logged in, click on User Control Panel on the left side just below the CDM logo, then Account Settings. Scroll down to the time settings and change settings as necessary.
For East Coast DST, the setting should be "GMT-4", for Central DST the setting should be "GMT-5" etc.
Be sure to hit the "Submit" button.
Time will not automatically update for Daylight Savings Time changes.