This setting determines the timezone which all dates and times on the web site appear in.
For example, scheduled games will be listed in the time you specify here.
Additionally, all emails sent to you containing game times will use this timezone.
The timezone shall always be listed at the bottom of each page so you can be sure what the setting is.
If you do not wish to specify a timezone, you can use the site default, which is listed at the base of the registration page.