[A few of the ones you have listed have dates too early -CNC coin, Starcoin, Zcc coin, Vertcoin.
Just taking the first one - the date is correct according to the pszTimeStamp and the genesis block datetime :
https://github.com/CHNCoin/CHNCoin/blob/master/src/main.cpp#L2011If you'll forgive me, I'm going to ignore any further unsupported assertions.
Cheers
Graham