What potential issue is highlighted in the forum thread regarding the calculation of total days in date intervals?

The potential issue highlighted in the forum thread is that when calculating total days in date intervals, the end date is not being included in the count. To solve this issue, we need to add 1 to the total days calculation to include the end date in the count.

// Start and end dates
$start_date = '2022-01-01';
$end_date = '2022-01-05';

// Calculate total days including the end date
$total_days = strtotime($end_date) - strtotime($start_date);
$total_days = floor($total_days / (60 * 60 * 24)) + 1;

echo "Total days in the interval: " . $total_days;