Returns the quarter and year in which a date occurs.
A vector convertible to
A numeric vector identifying the quarter that each element of
date corresponds to, expressed as a number of years since 1900.
Thus Q1-2000 is 100.00, and Q3-2007 is 107.50.
Steven L. Scott email@example.com
Quarter(c("2008-02-29", "2008-04-29")) #  108.00 108.25
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