tools

package main

import (

	"fmt"

	"log"

	"os"

	"strconv"

	"time"

)

func main() {

	if len(os.Args) < 2 {

		fmt.Println("Usage: unixtime timestamp...")

		os.Exit(-1)

	}

	for _, a := range os.Args[1:] {

		fmt.Println(a, "->", unixtime(a))

	}

}

func unixtime(s string) string {

	if isUnixTime(s) {

		ns, _ := strconv.ParseInt(s, 10, 64)

		t := time.Unix(0, ns).UTC()

		return t.Format("2006-01-02T15:04:05.999999Z")

	} else {

		t, err := time.Parse("2006-01-02T15:04:05.999999Z", s)

		if err != nil {

			log.Fatalln(err.Error())

		}

		return strconv.FormatInt(t.UnixNano(), 10)

	}

}

func isUnixTime(s string) bool {

	for _, r := range s {

		if r < '0' || r > '9' {

			return false

		}

	}

	return true

}