TYPO3 v9.1.15 Admin-Panel, Simulate FE-Time not working
The Admin-Panel function Simulate FE-Time is not working at all in TYPO3 version 9.1.15! Submitting the Admin-Panel form with changed "simulate date/time" will change the given date/time after submiting. The frontend doesn't actually seem to get the desired time, so records with start/stop time do not behave as expected!
After a long journey to find any configuration error in TYPO3 or PHP-Environment a downgrade to TYPO3 v9.1.14 worked to fix the issue. This indeed implies there must be any bug in TYPO3 Admin-Panel for v9.1.15 core.