2014-12←  2015-01 looping  →2015-02

20150101_0000 UTC	20150102_0000 UTC	20150103_0000 UTC	20150104_0000 UTC
20150105_0000 UTC	20150106_0000 UTC	20150107_0000 UTC	20150108_0000 UTC
20150109_0000 UTC	20150110_0000 UTC	20150111_0000 UTC	20150112_0000 UTC
20150113_0000 UTC	20150114_0000 UTC	20150115_0000 UTC	20150116_0000 UTC
20150117_0000 UTC	20150118_0000 UTC	20150119_0000 UTC	20150120_0000 UTC
20150121_0000 UTC	20150122_0000 UTC	20150123_0000 UTC	20150124_0000 UTC
20150125_0000 UTC	20150126_0000 UTC	20150127_0000 UTC	20150128_0000 UTC
20150129_0000 UTC	20150130_0000 UTC	20150131_0000 UTC

2014-12←  2015-01 looping  →2015-02