Description:
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From manual page: https://php.net/intldateformatter.parse
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Passing a totally wrong datetime format returns a valid but strange datetime despite the date formats being so different.

e.g. 2019-12-10 10:10:00 becomes 2016-06-10 09:10:00

If the date format is wrong to start with, should it not return null?

Test script:
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use IntlDateFormatter;
$formatter = new IntlDateFormatter('en_GB', 3, 3, 'Europe/London', 0, null);
$date = '2019-12-10 10:10:00';
echo date('Y-m-d H:i:s', $formatter->parse($date));

Expected result:
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null

Actual result:
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2016-06-10 09:10:00