dtt_date(1L)
dtt_date(-1)
dtt_date("2000-01-01")
as.Date(as.POSIXct("2019-05-01", tz = "Etc/GMT-8"))
dtt_date(as.POSIXct("2019-05-01", tz = "Etc/GMT-8"))
dtt_date(hms::as_hms("23:59:59"))
dtt_date(hms::as_hms("24:00:00"))
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