package main

import "fmt"
import "log"
import "os"
import "time"

func main() {
	if len(os.Args) != 3 {
		log.Fatalln("usage datediff <date1> <date2>")
	}

	FORMAT := "02/01/2006"
	d1, err := time.ParseInLocation(FORMAT, os.Args[1], time.Local)
	if err != nil {
		log.Fatalln("Invalid date 1", err)
	}
	d2, err := time.ParseInLocation(FORMAT, os.Args[2], time.Local)
	if err != nil {
		log.Fatalln("Invalid date 2", err)
	}

	dur := d2.Sub(d1)

	//fmt.Println(dur.String())

	fmt.Println(int64(dur / (24 * time.Hour)))
}