How to set properly TimeZone

[juandavidmarin368]

Hello, I am just trying to set up in a proper timezone, so that when using it on Vertx I set the timezone to the JDBC connection using c3p0, but the server seems not recognizing the settings, is there any other way to do it ?, when I make any query the server is adding 5 hours more, I can substract the hours programmatically but I have got a lot of queries to do

Thanks for any answer in advance,
Kind regards