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<?php $testDates = array( '2018-01-01', '2000-01-01', '1992-01-01', '1991-12-30', '1980-01-01', '1971-01-01', '1970-01-02', '1970-01-01', ); foreach($testDates as $testDate){ echo $testDate . ' - result:' . strtotime($testDate) . PHP_EOL; }

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