Calculate the difference in days, months, and years between two dates in PHP

Preface

Recently, in the process of developing a project, it is necessary to calculate the difference between the two dates 、 How many months 、 How many years? , A calculation method is summarized below , For your reference .

terms of settlement

/** *  Calculate the difference between the two dates / month / year  * @param string $start_time  Start date  * @param string $end_time  End date  * @param int $type  type （1： return int ,2： Months difference ,3： The difference is years ） */
function get_count_form_date($start_time, $end_time, $type = 1)
{
    
    //  Calculate the difference of days 
    if ($type == 1) {
    
        $datetime_start = new DateTime($start_time);
        $datetime_end = new DateTime($end_time);
        $days = $datetime_start->diff($datetime_end)->days;
        return $days;
    }
    [$y1, $m1, $d1] = explode("-", $start_time);
    [$y2, $m2, $d2] = explode("-", $end_time);
    //  Calculate the difference in months 
    if ($type == 2) {
    
        if ($y1 == $y2) {
    
            $month = $m2 - $m1;
        } else {
    
            $month = ($m2 - $m1) + ($y2 - $y1) * 12;
        }
        return $month;
    }
    //  Calculate the difference in years 
    if ($type == 3) {
    
        $year = $y2 - $y1;
        return $year;
    }
}

It's easy to call methods ：

$start_time = '2020-09-12';
$end_time = '2021-07-01';
$type = 1;
get_count_form_date($start_time, $end_time, $type = 1)

According to type Value returns ：292、10、1