MySQL upgrade to 5.6.4 from 5.6.33 on Ubuntu
I think you are wrong.

MySQL 5.6.33 is bigger than 5.6.4

For more information look at MySQL 5.6 release note:

https://dev.mysql.com/doc/relnotes/mysql/5.6/en/

MySQL 5.6.4 released at 2011-12-20 So MySQL 5.6.33 has already DateTime feature.