JavaScript timestamp to golang time.Time

time.go

package main

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

type MyJsonTime struct {
	time.Time
}

func (m *MyJsonTime) UnmarshalJSON(b []byte) error {
	if i, err := strconv.ParseInt(string(b[1:len(b)-1]), 10, 64); err != nil {
		return err
	} else {
		fmt.Println(i)
		*m = MyJsonTime{Time: time.Unix(i/1000, (i%1000)*1000*1000)}
		return nil
	}
}

func main() {
	someJSON := `{"foo":"1498891325771"}`

	var x struct {
		Foo *MyJsonTime `json:"foo"`
	}

	if err := json.Unmarshal([]byte(someJSON), &x); err != nil {
		panic(err)
	}

	fmt.Println(x.Foo.Format(time.RFC3339Nano))

	_ = json.NewDecoder(strings.NewReader(someJSON)).Decode(&x)
	fmt.Println(x)

}