Just back from Vegas and was surprised to see 5k less tier credits than expected on my Total Rewards account so I called my host to see what was on the go. I thought on a particular day I earned slightly over 5k tier credits, which would give me a 10k Tier Credit bonus. Caesars gaming days are 6:00am to 6:00am (at least at Planet Hollywood in Vegas). My first gaming session during this particular day I earned 4487 Tier credits, then I started my 2nd session at around 5:15am (I looked at my credits and saw that I only needed 513 TC's so decided to play until I reached that goal. At 5:45-5:50 I cracked the 5k for the day by accumulating over 600 additional TC's. I was up a little bit so I continued to play, and pulled my card out of the machine around 6:15am or so after earning over 950 TCs for that session in total. Well guess what? The day that your earned Tier Credits count towards is solely based on the time you pull your card out of the machine (not actual time earned, which was what I thought)!!!!! There went my 10k bonus (and I only received a 5k bonus for that day) on the trip putting me at 78,500 TC total, just shy of the Diamond 2 Aspirations ($750 airfare credit, limo etc)...UGH!!! I'm rotted to say the least, so I thought that I would pass on this valuable information to the group! Remember folks, it's CARD OUT that determines what day your credits are applied to!!! Cheers!