2018-05←  2018-06 looping  →2018-07

20180601_0000 UTC	20180602_0000 UTC	20180603_0000 UTC	20180604_0000 UTC
20180605_0000 UTC	20180606_0000 UTC	20180607_0000 UTC	20180608_0000 UTC
20180609_0000 UTC	20180610_0000 UTC	20180611_0000 UTC	20180612_0000 UTC
20180613_0000 UTC	20180614_0000 UTC	20180615_0000 UTC	20180616_0000 UTC
20180617_0000 UTC	20180618_0000 UTC	20180619_0000 UTC	20180620_0000 UTC
20180621_0000 UTC	20180622_0000 UTC	20180623_0000 UTC	20180624_0000 UTC
20180625_0000 UTC	20180626_0000 UTC	20180627_0000 UTC	20180628_0000 UTC
20180629_0000 UTC	20180630_0000 UTC

2018-05←  2018-06 looping  →2018-07