Hi,
I’ve encountered this strange timestamp error:
Any idea what could have caused this? It’s almost everywhere in our installation.
Maybe check the date format you’re using, see https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Configuration/#HDateformat
That was it. Simple case of dd.mm.yyyy instead of dd.MM.yyyy.
Sometimes I’m such an i***t. I forgot to say thanks! 
np! I’m glad it was easy to fix and that it worked.