Catch DateTime failure

[MGatner]

Description
If DateTime::createFromFormat fails then it causes unexpected behavior in our own createFromFormat. This checks for failure (return false) and throws an exception.

See: https://www.php.net/manual/en/datetime.createfromformat.php

Checklist:

• Securely signed commits
• Component(s) with PHPdocs
• Unit testing, with >80% coverage
• n/a User guide updated
• Conforms to style guide

[MGatner]

I'm locking PHPStan since minor updates keep causing CI issues. FYI @samsonasik we will want to do periodic updates but this has been needed for a while.

[samsonasik]

@MGatner yes, locking version is ok 👍

[samsonasik]

Thank you @MGatner