Question

I’m trying to convert the difference between two dates into a total year count, right now I’m using this:

 $datetime1 = new DateTime('2009-10-11'); 
 $datetime2 = new DateTime('2010-10-10');
 $interval = $datetime1->diff($datetime2);
 return $interval->format('%y');

This returns me an int (Like 0 for < than a year, 2 for two years, etc.)

I need the result to be decimal as following:

0.9 – 9 months

1.2 – 1 year and two months

3.5 – 3 years and five months

and so on..

Thanks!

Answer 1

If you don’t care about perfect accuracy:

return $interval->days / 365;

You could also do something like return $interval->y + $interval->m / 12 + $interval->d / 365.

Didn’t even notice your weird decimal convention until I saw @2unco’s comment. That would look like: return $interval->y . '.' . $interval->m.