1999-07←  1999-08 looping  →1999-09

19990806_0000 UTC	19990807_0000 UTC
19990808_0000 UTC	19990809_0000 UTC
19990810_0000 UTC	19990811_0000 UTC
19990812_0000 UTC	19990814_0000 UTC
19990815_0000 UTC	19990817_0000 UTC
19990818_0000 UTC	19990819_0000 UTC
19990821_0000 UTC	19990822_0000 UTC
19990824_0000 UTC	19990825_0000 UTC
19990826_0000 UTC	19990827_0000 UTC