Setting the time zone on your SportsSignup account is important for two reasons: First, by default your registration Sessions are set to end on a certain date, at 11:59:59 PM EST (Eastern Time). If your organization is in a different time zone, you can change the default setting. Second, User Alerts are posted and removed based on your local time zone.
To verify/set the time zone on your account:
Login as administrator and go to Manage Account | Manage Organization | Organization Info
Select the appropriate time zone for your organization from the drop-down box.