I wanted to debug some missing language strings,
so i switched on language debugging in backend.
If i do so, i get a 404 error on profile pages if user has entered his birthday.
If Date of birth is left empty, everything seems fine.
Error (on my own account) is:
0: DateTime::__construct(): Failed to parse time string (??1972??-??11??-??10?? ??00??:??00??:??00??) at position 0 (?): Unexpected character
If language debugging is switched off again, everything works well.
Is it a problem with the data format for my birthday database field?