update JPG file modification date using EXIF data

main.go

package main

import (
	"fmt"
	"github.com/rwcarlsen/goexif/exif"
	"io/ioutil"
	"os"
	"path"
	"path/filepath"
)

func main() {

	//argsWithProg := os.Args
	argsWithoutProg := os.Args[1:]

	if len(argsWithoutProg) < 0 {
		fmt.Println("Give me a directory")
		os.Exit(0)
	} else {

		dirname := os.Args[1]

		files, err := ioutil.ReadDir(dirname)
		if err != nil {
			panic(err)
		}

		for _, file := range files {
			fpath := path.Join(dirname, file.Name())

			if filepath.Ext(fpath) == ".JPEG" || filepath.Ext(fpath) == ".JPG" {
				println(fpath)

				f, err := os.Open(fpath)
				if err != nil {
					panic(err)
				}
				defer f.Close()
				x, err := exif.Decode(f)
				if err != nil {
					fmt.Println("Failed to decode ", fpath)
					panic(err)
				}
				tm, _ := x.DateTime()

				fmt.Println(tm.Date())

				err = os.Chtimes(fpath, tm, tm)

				if err != nil {
					fmt.Println(err)
				} else {
					fmt.Println("Changed the file time information")
				}

			}

		}
	}
}