I have an idea.

Let people set their timezone in their user settings, and when they login, all the times will be displayed in their own timezone. That should work
Just make sure you take daylight saving time into account. EST is Eastern Standard Time, not EDT, which is Eastern Daylight Time. Daylight saving time has been in effect since April 7th, so if you are reporting the time in EST, adjust your time one hour backwards. I've missed events (in other games) before, due to this confusion.

I also have a few questions about JDC events:

- How long do they last?
- Do you have to stay for the whole thing to get credit?
- Can you join in the middle of the game?
- What happens if you have to leave? (due to outside circumstances)

I've just never been in a JDC event before, so I don't know these specifics.

I'm thinking I'll be involved in JDC this season, because I really want to improve my JJ2 skills.