Description:
------------
Currently, there is no way for date_create_from_format() to accept one digit seconds/minutes. But they do accept one digit hours, month, and years:

    date_create_from_format('Y-m-d H:i:s', '2016-1-2 3:04:05');

will output a DateTime object, but the following code will return false:

    date_create_from_format('Y-m-d H:i:s', '2016-1-2 3:4:5');

Although backward compatibility may be an issue, I guess it would be nice if one digit seconds and minutes like '4:5' be accepted by date_create_from_format() and date_parse_from_format().

Test script:
---------------
var_export(date_create_from_format('Y-m-d H:i:s', '2016-1-2 3:4:5'));
var_export(date_parse_from_format('Y-m-d H:i:s', '2016-1-2 3:4:5'));


Expected result:
----------------
DateTime::__set_state(array(
   'date' => '2016-01-02 03:04:05',
   'timezone_type' => 3,
   'timezone' => 'Asia/Tehran',
))

array (
  'year' => 2016,
  'month' => 1,
  'day' => 2,
  'hour' => 3,
  'minute' => 4,
  'second' => 5,
  'fraction' => false,
  'warning_count' => 0,
  'warnings' => 
  array (
  ),
  'error_count' => 0,
  'errors' => 
  array (
  ),
  'is_localtime' => false,
)

Actual result:
--------------
false

array (
  'year' => 2016,
  'month' => 1,
  'day' => 2,
  'hour' => 3,
  'minute' => 0,
  'second' => 0,
  'fraction' => false,
  'warning_count' => 0,
  'warnings' => 
  array (
  ),
  'error_count' => 2,
  'errors' => 
  array (
    11 => 'A two digit minute could not be found',
    13 => 'A two digit second could not be found',
  ),
  'is_localtime' => false,
)