Rails - Jun 2006 - making a date object default to the last day of the month

hello all...question from a newbie trying to make a go at rails....

i have an account object which holds sundry information including a 
credit card expiration date.  i use date_select ( "object",
"method",
:order => [:month :year] ) to allow the user to select the month and 
year of his credit card''s expiration, but when this info is sent to the
model, somehow it defaults to a date object containing the correct 
month, correct year, and the first day of the selected month.  since 
credit cards dont expire until the end of the month, i want to be able 
to have the default action be to set it to the end day of the selected 
month.  i have figured out the logic if i have a date object...im just 
not sure where i should go about putting the code that does this...any 
suggestions?

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