2018-03←  2018-04 looping  →2018-05

20180401_0000 UTC	20180402_0000 UTC	20180403_0000 UTC	20180404_0000 UTC
20180405_0000 UTC	20180406_0000 UTC	20180407_0000 UTC	20180408_0000 UTC
20180409_0000 UTC	20180410_0000 UTC	20180411_0000 UTC	20180412_0000 UTC
20180413_0000 UTC	20180414_0000 UTC	20180415_0000 UTC	20180416_0000 UTC
20180417_0000 UTC	20180418_0000 UTC	20180419_0000 UTC	20180420_0000 UTC
20180421_0000 UTC	20180422_0000 UTC	20180423_0000 UTC	20180424_0000 UTC
20180425_0000 UTC	20180426_0000 UTC	20180427_0000 UTC	20180428_0000 UTC
20180429_0000 UTC	20180430_0000 UTC

2018-03←  2018-04 looping  →2018-05