reset jpg file created,updated time by exif. for mac.

reset_date_by_exif.rb

#!/usr/bin/env ruby
require 'time'

# usage
# resetdate.rb *.jpg

ARGV.each do |file|
  exif = {}
  `jhead #{file}`.strip.split("\n").each do|exif_data|
    k,v = exif_data.split(/ +: /)
    exif[k] = v
  end

  if exif['Date/Time']
    date = Time.strptime(exif['Date/Time'],'%Y:%m:%d %H:%M:%S')
    # update created,modified by exif data
    cmd = "setfile -d '#{date.strftime('%x %X')}' #{file}"
    cmd = "setfile -m '#{date.strftime('%x %X')}' #{file}"
    r = `#{cmd}`
    p r if r != ""
  end
end