I'm using this code to return the number of days between two dates - today, and a date from the database:
$now = new DateTime("now");
$date2 = new DateTime($row[$CalendarField]);
$interval = $now->diff($date2);
$age = $interval->days;
How can I alter the code so that $age
returns a negative value for dates in the past?
Look at the invert property in DateInterval class.
http://php.net/manual/en/class.dateinterval.php
You can also use characters r and R in DateInterval::format method.
http://php.net/manual/en/dateinterval.format.php
Try to replace your code with
$now = new DateTime("now");
$date2 = new DateTime($row[$CalendarField]);
$interval = $now->diff($date2);
$age = $interval->format('%r%a');