TimeZone problem with Oracle SQL Developer for Windows on MySQL server
I found the following solution on a forum (https://community.oracle.com/thread/4144569?start=0)

You have to just insert a string in the port value
PORT_NUM?SERVEROPTIONS&amp;dummyparam= and leave the database field empty

if you need to specify the database name, you just have to use this other string (I suppose, not tested)
PORT_NUM/DB_NAME?SERVEROPTIONS&amp;dummyparam=

Hope this is still relevant to you or maybe someone