golang自定义time格式输出

package jsontest

import (
    "encoding/json"
    "testing"
    "time"
)

type Time time.Time

const (
    timeFormart = "2006-01-02 15:04:05"
)

func (t *Time) UnmarshalJSON(data []byte) (err error) {
    now, err := time.ParseInLocation(`"`+timeFormart+`"`, string(data), time.Local)
    *t = Time(now)
    return
}

func (t Time) MarshalJSON() ([]byte, error) {
    b := make([]byte, 0, len(timeFormart)+2)
    b = append(b, '"')
    b = time.Time(t).AppendFormat(b, timeFormart)
    b = append(b, '"')
    return b, nil
}

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

type Person struct {
    Id       int64  `json:"id"`
    Name     string `json:"name"`
    Birthday Time   `json:"birthday"`
}

func TestTimeJson(t *testing.T) {
    now := Time(time.Now())
    t.Log(now)
    src := `{"id":5,"name":"xiaoming","birthday":"2016-06-30 16:09:51"}`
    p := new(Person)
    err := json.Unmarshal([]byte(src), p)
    if err != nil {
        t.Fatal(err)
    }
    t.Log(p)
    t.Log(time.Time(p.Birthday))
    js, _ := json.Marshal(p)
    t.Log(string(js))
}