Description:
------------
---
Its work with date '2011-03-27 03:59:59'
---


Test script:
---------------
$d = new DateTime('2011-03-27 03:59:59');
var_dump(['$d is' => $d]);
$d_new = $d->sub(new DateInterval('PT1H'));
var_dump(['$d_new is' => $d_new]);

Expected result:
----------------
array (size=1)
  '$d_new is' => 
    object(DateTime)[1]
      public 'date' => string '2011-03-27 02:59:59.000000' (length=26)
      public 'timezone_type' => int 3
      public 'timezone' => string 'Europe/Moscow' (length=13)

Actual result:
--------------
array (size=1)
  '$d_new is' => 
    object(DateTime)[1]
      public 'date' => string '2011-03-27 03:59:59.000000' (length=26)
      public 'timezone_type' => int 3
      public 'timezone' => string 'Europe/Moscow' (length=13)