What are common pitfalls when calculating date differences in PHP?

Common pitfalls when calculating date differences in PHP include not accounting for time zones, not considering leap years or daylight saving time adjustments, and not handling edge cases such as dates spanning multiple months or years. To accurately calculate date differences in PHP, it is recommended to use the DateTime class, which provides methods for performing date arithmetic while considering time zones and daylight saving time. Additionally, using the diff() method allows for easy calculation of differences between two DateTime objects.

$date1 = new DateTime('2022-01-01');
$date2 = new DateTime('2022-02-15');

$interval = $date1->diff($date2);
echo $interval->format('%R%a days');