What are the potential pitfalls of incorrectly using the Modulo operator in PHP for time calculations?

Incorrectly using the Modulo operator for time calculations in PHP can lead to unexpected results, especially when dealing with time intervals that cross over into different days. To solve this issue, it's important to convert the time values to seconds before applying the Modulo operator.

// Incorrect usage of Modulo operator for time calculations
$start_time = strtotime('23:00:00');
$end_time = strtotime('01:00:00');
$time_difference = $end_time - $start_time;
$remainder = $time_difference % 3600; // Incorrect usage of Modulo

// Correct way to use Modulo operator for time calculations
$start_time = strtotime('23:00:00');
$end_time = strtotime('01:00:00');
$time_difference = $end_time - $start_time;
$remainder = ($time_difference + 86400) % 86400; // Correct usage of Modulo for time calculations