Need during the Christmas holidays from 00 hours to 00 hours 24.12 27.12 include the banner.
But the time needed to obtain strictly on the timezone, specifically in Berlin, and not on the user's computer.
I.e. to turn on when in Berlin 00 the 24th on and off when in Berlin 00 on the 27th.
Below, the simplest version, just without regard to timezone, for clarity, did the opposite off these days, tell me what to add to make it all correct.