expires.spread: spread expires extraction method
In redmode/FinancialInstrument: Financial Instrument Model Infrastructure for R

Description Usage Arguments Author(s) See Also

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.

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  ## S3 method for class 'character'
 expires(x, Date, expired = TRUE,
    silent = FALSE, ...)

`Date`	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`).
`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.