To change your settings to your correct time zone, head over to the "Me" tab of your Dashboard and click "Edit Profile" under the "My Stuff" menu on the left side of the page. Then scroll down to "Account Settings."
On the left side of the page, directly below "Change Password," look for the "Time Zone" option. Click on the "Time Zone" bar, and a drop-down menu will appear. Then choose your time zone.
Click "Save Changes" at the bottom of the page, and your time zone will be updated.