x$expires
will be returned if it is not NULL
. Otherwise, the
(character representation of the) exiration date of the first-to-expire of
the members
will be returned.
# S3 method for spread
expires(x, Date, expired = TRUE, silent = FALSE, ...)
Can be a Date or character string. When expires
is a
vector, the retuned value will be one of the two values of expires
that are closest to Date
. (which one will be determined by the value
of expired
).
TRUE/FALSE. This determines which date will be used when
expires
is a vector. If expired
is TRUE
the date
returned will be the last one before Date
. If expired
is
FALSE
the first one after Date
will be returned.