When people datefag - here is what happens:

• the author has a satisfaction (only if he was right, which usually isn't the case and it's expected result because the plan that's easy to guess isn't a good Plan)

• the author is disappointed if he was wrong (most of the cases)

• the author can be remembered by the other community member as the one who wasn't right

• the media can use your post to show that the predictions by Q "conspiracy theory" are wrong

• people who search for the truth can come to the same conclusion as the above (they found Q but they conclude it's crazy and wrong)

• it will work WAY WAY WAY better if you wait and then publish the same date matching as a FACT and Q PROOF rather than failed prediction

• new joiners will need proofs from their recent memory/facts, I know there is more than 100 Q proofs but the 20-30 that I've watched myself happening live we're the most important to me

Only the 1st thing is an incentive, but it's very unlikely you will be rewarded for it, so please consider this probability and all other reasons and never do it.

EDIT: After your comments: Yes, you can do it and keep it for yourself. Then you will be able to publish your own Q proof as soon as it's verified (so post-factum).