Check if the given x is of any known Date type.
IsDate(x, what = c("either", "both", "timeVaries"))logical vector of the same dimension as x.
a vector or values to be checked.
can be any value out of "either" (default), "both" or "timeVaries".
Frank E Harrell
This checks for many known Date and Time classes: "POSIXt", "POSIXct", "dates", "times", "chron", "Date".
Year, Month, etc.
IsDate(as.Date("2013-04-10"))
IsDate(31002)
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