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\title{Is a year a leap year?}
\item{date}{a date-time object or a year}
TRUE if x is a leap year, FALSE otherwise
If x is a recognized date-time object, leap_year will
return whether x occurs during a leap year. If x is a
number, leap_year returns whether it would be a leap year
under the Gregorian calendar.
x <- as.Date("2009-08-02")
leap_year(x) # FALSE
leap_year(2009) # FALSE
leap_year(2008) # TRUE
leap_year(1900) # FALSE
leap_year(2000) # TRUE
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