What are potential pitfalls when comparing dates in PHP?

When comparing dates in PHP, a potential pitfall is not taking into account the time zone differences, which can lead to inaccurate comparisons. To avoid this issue, it is recommended to always use the DateTime object and set the time zone explicitly before comparing dates. 

$date1 = new DateTime('2022-01-01', new DateTimeZone('UTC'));
$date2 = new DateTime('2022-01-01', new DateTimeZone('UTC'));

$date1->setTimezone(new DateTimeZone('America/New_York'));
$date2->setTimezone(new DateTimeZone('America/New_York'));

if ($date1 == $date2) {
    echo 'Dates are equal.';
} else {
    echo 'Dates are not equal.';
}

Keywords

DateTime date comparison timezone strtotime date_format

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