How to include the startdate when create the date->diff in php - php

Question

How to include the startdate as well. When you count days it omits the first day, but i want to include the first day as well.
$d1 = '2018-02-01 00:00:00';
$d2 = '2018-02-05 00:00:00';
function timeDifference($dT1, $dT2){
$d1 = new DateTime($dT1);
$d2 = new DateTime($dT2);
$d = $d1->diff($d2);
$total = $d->days;
$month = $d->m.' months';
$days = $d->d.' days';
if ($total > 30) {
$returnDate = $month.' '.$days;
}
else {
$returnDate = $days;
}
return $returnDate;
}
echo timeDifference($d1, $d2); // 4 (i want 5)

Answer 1

Well, the difference between the 01. and 05. is four days, it's not ignoring anything. Why don't you do it like that?
€dit: Please note that this can still go wrong for a date difference which will exceed a month (e.g. 30 days +1 = 31, but the month only has 30 days...)
<?PHP
$d1 = '2018-02-01 00:00:00';
$d2 = '2018-02-05 00:00:00';
function timeDifference($dT1, $dT2){
$d1 = new DateTime($dT1);
$d2 = new DateTime($dT2);
$d = $d1->diff($d2);
$total = $d->days;
$month = $d->m.' months';
$dayDifference = $d->d;
if($dayDifference !== 0)
{
$dayDifference++;
}
$days = $dayDifference.' days';
if ($total > 30) {
$returnDate = $month.' '.$days;
}
else {
$returnDate = $days;
}
return $returnDate;
}
echo timeDifference($d1, $d2);
?>
2:
<?PHP
$d1 = '2018-02-01 00:00:00';
$d2 = '2018-02-05 00:00:00';
function timeDifference($dT1, $dT2){
$d1 = new DateTime($dT1);
$d1->sub(new DateInterval("P1D"));
$d2 = new DateTime($dT2);
$d = $d1->diff($d2);
$total = $d->days;
$month = $d->m.' months';
$days = $d->d.' days';
if ($total > 30) {
$returnDate = $month.' '.$days;
}
else {
$returnDate = $days;
}
return $returnDate;
}
echo timeDifference($d1, $d2);
?>

Answer 2

The function works as expected. Between date 2018-02-01 00:00:00 and date 2018-02-05 00:00:00 there are effectively 4 days (01, 02, 03, 04). The fifth is not counted because the date 2018-02-05 00:00:00 is considered as the upper limit.
If you wish your function returns 5 instead of 4, make the increment inside it or make the right hand side input date 2018-02-06 00:00:00.