CalendarDateSelect plugin Localize

Hi everyone, I am developing in spanish, am using the
CalendarDateSelect plugin using the localize script, as is in the
plugin web page, but when When I translate it I can't save the date to
DB because "Enero" it's not "January" and Rails can't understand it.
There is a solution in the same webpage, but I can't change this
format.rb file, So where I must define the new parse format to be
possible save the date in teh DB.

Thanks

PD: Sorry about my english

gianpero