What are potential pitfalls when using PHP to calculate weekdays between two dates, especially when dealing with daylight saving time changes?

When calculating weekdays between two dates in PHP, a potential pitfall arises when encountering daylight saving time changes. To solve this issue, it is important to account for the changes in time offsets that occur during daylight saving time transitions. One way to address this is by using PHP's DateTime class along with the setTimeZone() method to handle the time zone adjustments automatically. 

$start_date = new DateTime('2022-03-01');
$end_date = new DateTime('2022-03-15');

$interval = new DateInterval('P1D'); // 1 day interval
$date_range = new DatePeriod($start_date, $interval, $end_date);

$weekdays = 0;
foreach ($date_range as $date) {
    if ($date->format('N') < 6) { // Monday to Friday are weekdays (1 to 5)
        $weekdays++;
    }
}

echo $weekdays;

Keywords

PHP date timezones daylight saving time calculations

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