Have a site registering users. The user record in the CP says they registered at 11:39 June 12.
The database 'dateCreated' says 10:39.
The site settings timezone are UTC+1 BST.
PHP config date.timezone is Europe/London (actual location) and Default timezone is UTC.
If I turn off UTC +1 in Craft timezone settings to UTC then front end user record matches database.
What I can't figure out for sure is what time did they really register? :)