golang json decode example

gistfile1.go

package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"log"
	"time"
)

/*
I have an struct, say Obj, with a time.Time field, when I decode a stream with json.Decode into Obj the time are formatted as
2015-07-26 11:37:28.377841064 +0000 UTC while if I decode into interface{} they are formatted as 2015-07-26T11:37:28.429525113Z
how do I get 2015-07-26T11:37:28.429525113Z even when decoding into Obj?
*/

type Date struct{ time.Time }

func (d *Date) UnmarshalJSON(data []byte) error {
    var s string
    if err := json.Unmarshal(data, &s); err != nil {
        return fmt.Errorf("birthdate should be a string, got %s", data)
    }
    t, err := time.Parse("2006/01/02", s)
    if err != nil {
        return fmt.Errorf("invalid date: %v", err)
    }
    d.Time = t
    return nil
}

type Person struct {
	Name string
	Born Date `json:"birthdate"`
}

func main() {
	data := []byte(`
    	{
	        "name": "Gopher",
		"birthdate": "2009/11/10"
	}
	`)

	var p Person
	dec := json.NewDecoder(bytes.NewReader(data))
	if err := dec.Decode(&p); err != nil {
		log.Fatalf("parse person: %v", err)
	}
	fmt.Println(p)
}