exif_edit.rb

# usage: 
# install exiftool from http://www.sno.phy.queensu.ca/~phil/exiftool/
# set folder name as yyyymmdd(ex.20060801)
# and type
# ls | ruby exif_edit.rb
while gets
	folder = $_.chomp
	date = folder[0..3] +":"+ folder[4..5] + ":" + folder[6..7] +  " 12:0:0"  
	`exiftool -alldates=\'#{date}\' -overwrite_original #{folder}/*.JPG`
	p folder
	p date
end