No data using time range

Hello,

I have a mariaDB database where I store home power data with timestamp. The timestamp is UTC time, I live in CEST time (+2h now). When I put this in a time series graph and I want to display the last 15mn it doesn’t work. I need to show 3 hours (more than 2) for the data to show on the graph but they display with the CEST hour. I can’t find a way to have the time range working.

The query is :

SELECT
  clock AS "time",
  PAPP
FROM stream
WHERE
  $__timeFilter(clock)
ORDER BY clock

Do you have any solution ?