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Changes between Initial Version and Version 1 of Ticket #31809, comment 4

initial	v1
1	1	I am hesitant about issue as reported. The function is clearly documented to accept non-nullable string in `Y-m-d H:i:s` format. Passing it `null` does not seem to be either explicitly or implicitly meaningful.
2	2
3		Returning ~~current~~ date is a case for invalid input, which ''is'' confusing as for me, but that's how it is written as of right now. I do not see how returning ''current'' time ''for invalid input'' is especially more meaningful or desired. It’s an error case. If anything it should probably fail altogether on it, but backwards compatibility.
	3	Returning "zero" date is a case for invalid input, which ''is'' confusing as for me, but that's how it is written as of right now. I do not see how returning ''current'' time ''for invalid input'' is especially more meaningful or desired. It’s an error case. If anything it should probably fail altogether on it, but backwards compatibility.
4	4
5	5	What are the good reasons here to change behavior in such way?