Hi all,

I use linux OS. I would like to convert a file with the folloing format:
-rw-r--r-- 1 student student 11289 26. Jul 22:41 listing.txt

into FileName, Year, Month, Day

In order to do this, i would like to convert the month string from "Jul"
in to the number 7.

I wrote the following code:

def ConvertMonthToNumber(MonthStr)
        case MonthStr
                when "Jan"  then  1
                when "Feb"  then  2
                when "Mar"  then  3
                when "Apr"  then  4
                when "May"  then  5
                when "Jun"  then  6
                when "Jul"  then  7
                when "Aug"  then  8
                when "Sep"  then  9
                when "Okt"  then 10
                when "Nov"  then 11
                when "Dec"  then 12
        end
end

when i run this code, i get the following error:
SortList.rb:7: formal argument cannot be a constant
def ConvertMonthToNumber(MonthStr)
                                 ^

My questions are:
1. Is there already a function that does in Ruby?
2. How to correct this bug?

Thanks
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