How can errors in time calculations be identified and resolved in PHP code?

To identify and resolve errors in time calculations in PHP code, it is important to ensure that the correct time zone is set, use the appropriate functions for time calculations, and handle daylight saving time changes properly. One common mistake is not considering time zones when working with dates and times, which can lead to incorrect results in calculations.

// Set the correct time zone
date_default_timezone_set('UTC');

// Perform time calculation
$start_time = strtotime('2022-01-01 08:00:00');
$end_time = strtotime('2022-01-01 10:30:00');
$time_difference = $end_time - $start_time;

// Display the result
echo "Time difference: " . gmdate("H:i:s", $time_difference);