An instant is a specific moment in time. Most common date-time
objects (e.g, POSIXct, POSIXlt, and Date objects) are instants.
an R object
TRUE if x is a POSIXct, POSIXlt, or Date object, FALSE otherwise.
is.timespan, is.POSIXt, is.Date
is.instant(as.Date("2009-08-03")) # TRUE
is.timepoint(5) # FALSE
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