How do I find out the last day of the previous month? In other words, I want a subroutine that, when run today, will return "09/30/2012" (a string in mm/dd/yyyy format)? If the function is run a week from now it will return "10/31/2012"? And if the function was run sometime last March, it would return "02/29/2012" (leap-year day). How do I do this?
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