It's recommended to use UTC timezone internally, convert to users timezone and date/timeformat for outputs and convert userinput back to UTC.
works for me. I*m also on UTC+1. Local time is summertime!
UTC: 2016-08-18 06:30:31, Local user time 2016-08-18 08:30:31
The Joomla methods helps with the conversions.
The instructions you followed might not be that useful for Joomla.
I don't know what the httpde.conf setting is influencing. Probably your setting for MySql is the problem. I do not want to test, as I*m not sure what happens if I add a timezone to my.ini.
I think, the date related filetypes are stored as UTC and only shown as defined in the settings when using the db-tools.
If not, you're in trouble, if you have important data in the database.
(I do have a setting in php.ini: date.timezone = Europe/Xyz, Where Xyz can be Athens or any other supported city )
Please test and let us know.