What potential pitfalls should be considered when using strtotime function in PHP for time calculations?

When using the strtotime function in PHP for time calculations, one potential pitfall to consider is the reliance on relative time formats which can lead to unexpected results, especially when dealing with timezones or daylight saving time changes. To avoid this issue, it's recommended to always provide a specific date and time format to strtotime for accurate calculations. 

// Example of using strtotime with a specific date and time format to avoid potential pitfalls
$date = '2022-01-01 12:00:00';
$new_date = strtotime($date . ' +1 day');
echo date('Y-m-d H:i:s', $new_date);

Keywords

strtotime PHP time calculations date format timezone

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