Description:
------------
---
From manual page: http://www.php.net/datetime.format#Parameters
---
Note about the time diff format string:
As far as I can tell, the datetime diff format string I ended up using is not documented anywere. The PHP manual says that the format string for the time diff is a "format accepted by date()". That would look like 'Y-m-d H:i:s', but that did not work. The other documented format I could find is the one accepted by strftime. That would look like '%Y-%M-%D %H:%i:%s', but that did not give leading zeroes for minutes and seconds.

$my_birth_tz=new DateTimeZone('America/Phoenix');
$my_birth=new DateTime('1956-09-19 08:38:00',$my_birth_tz);
$my_marriage_tz=new DateTimeZone('America/Los_Angeles');
$my_marriage=new DateTime('1981-12-14 11:38:00', $my_marriage_tz);
$my_marriage_age=$my_marriage->diff($my_birth);
echo $my_marriage_age->;format('%Y-%M-%D %H:%I:%S');
// Result: 25-02-25 04:00:00


Test script:
---------------
$my_birth_tz=new DateTimeZone('America/Phoenix');
$my_birth=new DateTime('1956-09-19 08:38:00',$my_birth_tz);
$my_marriage_tz=new DateTimeZone('America/Los_Angeles');
$my_marriage=new DateTime('1981-12-14 11:38:00', $my_marriage_tz);
$my_marriage_age=$my_marriage->diff($my_birth);
echo $my_marriage_age->;format('%Y-%M-%D %H:%I:%S');
// Result: 25-02-25 04:00:00
// Note the non-documented format() string.

echo $my_marriage_age->;format('%Y-%M-%D %H:%i:%s');
// Result: 25-02-25 04:0:0
// Expected 25-02-25 04:00:00 from the documented format string.


Expected result:
----------------
// Expected 25-02-25 04:00:00 from the documented format string.

I wanted leading zeros.


Actual result:
--------------
// Result: 25-02-25 04:0:0

No leading zeros.