If upstream call fails throw exception as well

[tomasfejfar]

The expression \DateTime::createFromFor...mat, $time, $timezone); of type DateTime|false adds false to the return on line 27 which is incompatible with the return type documented by TomasFejfar\DateTime\Dat...trict::createFromFormat of type DateTime.

[tomasfejfar]

I'd like the method to throw exception as well if the internal createFromFormat returns false.

[aautar]

Seemed simple:
#2

However, I couldn't find a case where \DateTime::createFromFormat() returns false, but there are no warning or errors. If you know of a case, I can write a test.

[tomasfejfar]

You are certainly right. But I thought that it would be a nice to handle the edge case anyway to make it futureproof. Also I thought it would be a nice easy pullrequest for someone to do for hacktoberfest :)