Events should not overlapping when two events are having same start and end dates

[santhureddy008]

Below are the my events, please find solution.
var events = [ { 'start': '2012-01-01 13:00:00', 'end': '2012-01-01 13:00:00' }, { 'start': '2012-01-01 13:00:00', 'end': '2012-01-01 13:00:00'} ];