Congrats Hobo and thanks for the contest. My guess is: August 15th 12 A.M. (Indian Independence Day )
There is no reason for you not to enter. Perhaps I misspoke - the prizes are non-denominational and have "Winter Holiday" scenes (not Christmas scenes as I originally described).
August 12th, at 5PM for the 20,000 members and August 9th, 1PM for your 5,000 post. Thanks for the contest!
Registration for this contest has now ended. CoinTalk membership passed 19,980 earlier today and now stands at 19,984. Do not edit your post with your winning guess because the time to guess the date and time when the 20,000th CT member joins has passed. By the way, this is my 5,000th post. 8-9-09 at 8:48 PM MDT. (Guessing the date and time of my 5,000th post was not a part of this contest.)
Best I can do is to give you a range. When I signed off at 3:32 yesterday we were still at 99. Speedy posted at 6:18 that we were at 05. So somewhere in that approx 3 hr window #20,000 joined. That's the best I can do for ya buddy. Now Peter may be able to pin it down for you if the software allows him to do that, but he may not be able to as well. Ask him.