MB04 intervals of clock drift

  Begin                    End
2012/ 2/14/  4:11:00 - 2012/ 2/20/  4:52:00
2012/ 5/27/  6: 9:00 - 2012/ 7/10/  6:17:00
2012/12/10/ 23:31:00 - 2013/ 2/ 6/  5:56:00
2013/ 3/19/  5:44:00 - 2013/ 6/20/  1:45:00

MB07 interval of clock drift

  Begin                    End
2012/03/12 00:00:00 - 2012/06/12 00:00:00