Description:
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MySQL uses the questionable format '0000-00-00' for a date that has not been set. A kind of null value for at date.
I fed this date into date_parse(), and got rather an unexpected result: It returns year 2000.

Reproduce code:
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$d= '0000-00-00';
print_r (date_parse($d)) ;


Expected result:
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Array ( [year] => 0000 [month] => 0 [day] => 0  ...

or false or null or an error of some kind.

Actual result:
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Array ( [year] => 2000 [month] => 0 [day] => 0  ...