Question

My server uses an older version of PHP, so I unfortunately can’t use the $datetime1->diff($datetime2) method.

I am currently using the following code, but it doesn’t really work:

$from = explode("-",date("Y-m-d",$recurring_invoices->start_date));
$to = explode("-",date("Y-m-d",$to_time));
$months = ($to[0]-$from[0])*12+$to[1]-$from[1];

It will calculate July 30th to June 1st as one whole month. It should only count dates from July 1st to June 1st as a whole month.

I noticed there was a MYSQL TIMESTAMPDIFF function, but I can’t seem to get that to work either.

$query = "SELECT TIMESTAMPDIFF(MONTH,'$recurring_invoices->start_date','$from_time')";
print_r($this->queryResult($query));

or

$query = "SELECT TIMESTAMPDIFF(MONTH, from_date, to_date) FROM agenda";
print_r($this->queryResult($query));

Your help is much appreciated!

Answer 1

I think this should work, but it is untested now tested and fixed:

list($startYear, $startMonth, $startDay) = explode('-', date('Y-n-j', $recurring_invoices->start_date));
list($endYear, $endMonth, $endDay) = explode('-', date('Y-n-j', $to_time));

$months = 0;
$months += ($endYear-$startYear) * 12;
$months += $endMonth - $startMonth;
if ($startDay > $endDay) {
  $months -= 1;
}

echo $months;