ansible module written in go-lang. This is almost same as http://ansible.cc/docs/moduledev.html#reading-input

main.go

package main

import (
	"fmt"
	"os"
	"io/ioutil"
	"strings"
	"time"
	"encoding/json"
)

type Time struct {
    Time string `json:"time"`  // this will be changed to {"time": string}
}

func main() {
	// the format is a little bit wired. see http://golang.org/pkg/time/#pkg-constants
	f := "2006-01-02 15:04:06"

	data, err:= ioutil.ReadFile(os.Args[1])
	if err != nil {panic(err)}
	arg := strings.Split(string(data), " ")[0]

	if strings.Contains(arg, "="){
		f = strings.Split(arg, "=")[1]
	}

	t := time.Now()
	m := Time{t.Format(f)}  // create Time struct with string
	s, err := json.Marshal(m)  // produce JSON from Time struct
	if err != nil {
		fmt.Println(err)
	}else{
		fmt.Printf("%s", s)
	}
}