2018-12←  2019-01 looping  →2019-02

20190101_0000 UTC	20190102_0000 UTC	20190103_0000 UTC	20190104_0000 UTC
20190105_0000 UTC	20190106_0000 UTC	20190107_0000 UTC	20190108_0000 UTC
20190109_0000 UTC	20190110_0000 UTC	20190111_0000 UTC	20190112_0000 UTC
20190113_0000 UTC	20190114_0000 UTC	20190115_0000 UTC	20190116_0000 UTC
20190117_0000 UTC	20190118_0000 UTC	20190119_0000 UTC	20190120_0000 UTC
20190121_0000 UTC	20190122_0000 UTC	20190123_0000 UTC	20190124_0000 UTC
20190125_0000 UTC	20190126_0000 UTC	20190127_0000 UTC	20190128_0000 UTC
20190129_0000 UTC	20190130_0000 UTC	20190131_0000 UTC

2018-12←  2019-01 looping  →2019-02