What potential issues can arise when converting dates in PHP, especially for dates before 1970?

When converting dates in PHP, especially for dates before 1970, potential issues can arise due to the limitations of Unix timestamps which start from January 1, 1970. To handle dates before 1970, you can use PHP's DateTime class which provides better support for a wider range of dates. 

$dateString = '1960-05-15';
$date = new DateTime($dateString);
echo $date->format('Y-m-d');

Keywords

strtotime date timestamp Unix epoch Y2K bug

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