! in time format.

DateTime_createFromFormat.php

<?php

$time = '03/2014';
$dt1 = \DateTime::createFromFormat('m/Y', $time);  // "2014-03-19 17:14:38"
$dt2 = \DateTime::createFromFormat('!m/Y', $time); // "2014-03-01 00:00:00"
$dt3 = \DateTime::createFromFormat('m/Y!', $time); // "1970-01-01 00:00:00"
$dt4 = \DateTime::createFromFormat('m!/Y', $time); // "2014-01-01 00:00:00"
var_dump($dt1, $dt2, $dt3, $dt4);

/*
result 
object(DateTime)#1 (3) {
  ["date"]=>
  string(19) "2014-03-19 17:14:38"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Asia/Ho_Chi_Minh"
}
object(DateTime)#2 (3) {
  ["date"]=>
  string(19) "2014-03-01 00:00:00"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Asia/Ho_Chi_Minh"
}
object(DateTime)#3 (3) {
  ["date"]=>
  string(19) "1970-01-01 00:00:00"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Asia/Ho_Chi_Minh"
}
object(DateTime)#4 (3) {
  ["date"]=>
  string(19) "2014-01-01 00:00:00"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Asia/Ho_Chi_Minh"
}
 */