Get timestamp from rawlist

Hello ! I got a ftp_rawlist and want to read the date out of that. (I don't want to use ftp_mdtm, because it slows down the whole script and I have to get the rawlist anyhow). So I got: - a month (not as Integer, as a string: "Jan", "Feb"...) - a day (Integer) - a field, which contains either a daytime (0:59) OR a year (if it's not the actual year, like "1998") Is there a function to convert the date I got from ftp_rawlist to a unix timestamp ? Regards Martin