A php function to calculate pawn months in Myanmar

calculate_myanmar_pawn_months.php

<?php

function calculate_pawn_months($start_date, $end_date)
{
    $start_date = new DateTime($start_date);
    $end_date = new DateTime($end_date);

    $diff_months = ($start_date->diff($end_date)->m + ($start_date->diff($end_date)->y * 12));
    $total_days = $start_date->diff($end_date)->d;

    if ($diff_months > 0) {
        if ($total_days > 0) {
            if ($total_days <= 15) {
                $diff_months += 0.5;
            } else {
                $diff_months += 1;
            }
        }
    } else {
        $diff_months = 1;
    }

    return $diff_months;
}

?>