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

Description Usage Arguments Author(s) See Also

if no instrument can be found by the id of x, or if the instrument does not have an expires attribute, an attempt will be made to infer the year and month of expiration using parse_id in which case the returned value will be a string of the format “YYYY-MM”. Presently, Date and expired will be ignored if x is not the name of an instrument

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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.
`silent`	silence warnings?