Json Un/Marshaling Time in UNIX epoch time

timejson.go

package main

import (
	"encoding/json"
	"fmt"
	"strconv"
	"time"
)

type jsonTime time.Time

type MyStruct struct {
	Date jsonTime
}

func (t jsonTime) MarshalJSON() ([]byte, error) {
	return []byte(strconv.FormatInt(time.Time(t).Unix(), 10)), nil
}

func (t *jsonTime) UnmarshalJSON(s []byte) (err error) {
	q, err := strconv.ParseInt(string(s), 10, 64)
	
	if err != nil {
		return err
	}
	*(*time.Time)(t) = time.Unix(q, 0)
	return
}

func (t jsonTime) String() string { return time.Time(t).String() }

func main() {
	s := MyStruct{Date:jsonTime(time.Now())}
	fmt.Println(s.Date)
	js, err := json.Marshal(s)
	fmt.Println(string(js), err)
	
	b := []byte(`{"Date": 1257894001}`)
	var m MyStruct
	err = json.Unmarshal(b, &m)
	fmt.Println(m.Date, err)
}