json编码含有time.Time类型的结构体时的格式化

structtime2json.go

package main

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

type JsonTime struct {
	time.Time
}

func (this JsonTime) MarshalJSON() ([]byte, error) {
	return []byte(fmt.Sprintf("%d", this.Year())), nil
}

type Person struct {
	Name  string
	Birth JsonTime
}

func main() {
	p := &Person{
		Name:  "hahah",
		Birth: JsonTime{time.Now()},
	}
	fmt.Println(p.Birth)
	b, e := json.Marshal(p)
	if e != nil {
		fmt.Println(e)
	}
	fmt.Printf("%s\n", b)
}