[1,2]
[0]
[4,5,6]
['']	['1970-01-01']	['1970-01-01 03:00:00']
[0]	['']	['1970-01-01 00:00:00']	['1970-01-01']
[0]	['0']	['2015-01-01 00:00:00']	['2015-01-01']
[0,1]	['']	['2015-01-01 00:00:00','2015-01-01 00:00:01']	['2015-01-01','2015-01-02']
[0]	['0']	['2015-01-01 00:00:00','2015-01-01 00:00:01','2015-01-01 00:00:02']	['2015-01-01','2015-01-02','2015-01-03']
[0]	['']	['2015-01-01 00:00:00','2015-01-01 00:00:01','2015-01-01 00:00:02','2015-01-01 00:00:03']	['1970-01-01']
[0,1]	['0']	['1970-01-01 00:00:00']	['2015-01-01']
[0]	['']	['2015-01-01 00:00:00']	['2015-01-01','2015-01-02']
[0]	['0']	['2015-01-01 00:00:00','2015-01-01 00:00:01']	['2015-01-01','2015-01-02','2015-01-03']
[0,1]	['']	['2015-01-01 00:00:00','2015-01-01 00:00:01','2015-01-01 00:00:02']	['1970-01-01']
[0]	['0']	['2015-01-01 00:00:00','2015-01-01 00:00:01','2015-01-01 00:00:02','2015-01-01 00:00:03']	['2015-01-01']