Description:
------------
strtotime is returning the same value for "2016-03-13 02:00:00" and "2016-03-13 03:00:00". The resulting date() is incorrect when the hour is 2. During this hour the 3600 seconds that would be added to strtotime is skipped.

Test script:
---------------
for($i=0;$i<10;$i++){
  echo strtotime('2016-03-13 0'.$i.':00:00');
  echo '<br>';
  echo date('g:i A',strtotime('2016-03-13 0'.$i.':00:00'));
  echo '<br>';
}

Expected result:
----------------
1457848800
12:00 AM
1457852400
1:00 AM
1457856000
2:00 AM
1457859600
3:00 AM
1457863200
4:00 AM
1457866800
5:00 AM
1457870400
6:00 AM
1457874000
7:00 AM
1457877600
8:00 AM
1457881200
9:00 AM

Actual result:
--------------
1457848800
12:00 AM
1457852400
1:00 AM
1457856000 (correct strtotime value)
3:00 AM    (incorrect hour value from date)
1457856000 (strtotime skips 3600 seconds)
3:00 AM    
1457859600
4:00 AM
1457863200
5:00 AM
1457866800
6:00 AM
1457870400
7:00 AM
1457874000
8:00 AM
1457877600
9:00 AM