filter file for specific date

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http://unix.stackexchange.com – My OS is Solaris 10 (64 bit) and I have many files in a logs directory where we receive 40-50 logs every day. I have last 20 days file present in this directory and I want to move each day file to a particular directory whose name is appended with the date of file. For example File_name date 1.txt 31-jul-20122 2.txt 01-Aug-2012 then create a directory for old files belongs to 31-jul-2012 and move to new directory 31-jul RIO_31-Jul-2012 and move them and like wise for 01-aug files. I have written a scripts which is running fine for current date but i don't know how t modify it (HowTos)