Good morning,
Trifacta won't be changing the value of the timestamp returned from the MySQL database unless specified in transformation.
I think our first task should be finding out what timezone the MySQL database is storing the date fields. There is a good discussion on it here: https://stackoverflow.com/questions/2934258/how-do-i-get-the-current-time-zone-of-mysql
Once we have that, we can use that information to convert the timestamp to the target timezone we want. You could either do the conversion in the SQL (select convert_tz(now(),@@session.time_zone,'+03:00')) or use the Trifacta timezone recipe steps to do that (https://docs.trifacta.com/display/SS/EXAMPLE+-+Time+Zone+Conversion+Functions)
I hope this helps.