Time formatting solution for golang structure json

I'm really ashamed that I haven't written a blog post after using OSC for so long! Write the first one here.
When developing a project recently, I found a time format problem in the Json conversion of a structure. i.e. this 1993-01-01T20:08:23.000000028+08:00 this means UTC method. From our habit, we prefer the format of 1993-01-01 20:08:23. The reproduced code is as follows:

package main

import (
    "time"
    "encoding/json"
)

type Student struct {
    Name string     `json:"name"`
    Brith time.Time `json:"brith"`
}

func main()  {
    stu:=Student{
        Name:"qiangmzsx",
        Brith:time.Date(1993, 1, 1, 20, 8, 23, 28, time.Local),
    }

    b,err:=json.Marshal(stu)
    if err!=nil {
        println(err)
    }

    println(string(b))//{"name":"qiangmzsx","brith":"1993-01-01T20:08:23.000000028+08:00"}
}

Encountering such a problem, how does Golang solve it? There are two solutions, let's take a look at them one by one.

Via the time.Time type alias

type JsonTime time.Time
// 实现它的json序列化方法
func (this JsonTime) MarshalJSON() ([]byte, error) {
    var stamp = fmt.Sprintf("\"%s\"", time.Time(this).Format("2006-01-02 15:04:05"))
    return []byte(stamp), nil
}
type Student1 struct {
    Name string     `json:"name"`
    Brith JsonTime  `json:"brith"`
}
func main()  {

    stu1:=Student1{
        Name:"qiangmzsx",
        Brith:JsonTime(time.Date(1993, 1, 1, 20, 8, 23, 28, time.Local)),
    }
    b1,err:=json.Marshal(stu1)
    if err!=nil {
        println(err)
    }

    println(string(b1))//{"name":"qiangmzsx","brith":"1993-01-01 20:08:23"}
}

Use structure composition

Compared with the first method, this method is a bit more complicated, and I don't recommend it very much. It's just an extended tutorial.

type Student2 struct {
    Name string     `json:"name"`
    // 一定要将json的tag设置忽略掉不解析出来
    Brith time.Time  `json:"-"`
}
// 实现它的json序列化方法
func (this Student2) MarshalJSON() ([]byte, error) {
    // 定义一个该结构体的别名
    type AliasStu Student2
    // 定义一个新的结构体
    tmpStudent:= struct {
        AliasStu
        Brith string `json:"brith"`
    }{
        AliasStu:(AliasStu)(this),
        Brith:this.Brith.Format("2006-01-02 15:04:05"),
    }
    return json.Marshal(tmpStudent)
}
func main()  {
    stu2:=Student2{
        Name:"qiangmzsx",
        Brith:time.Date(1993, 1, 1, 20, 8, 23, 28, time.Local),
    }

    b2,err:=json.Marshal(stu2)
    if err!=nil {
        println(err)
    }

    println(string(b2))//{"name":"qiangmzsx","brith":"1993-01-01 20:08:23"}
}

This method uses the combination of Golang's structures, which can implement OOP inheritance, and also reflects Golang's flexibility.

The above code is composed as a whole and posted below.

package main

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

type Student struct {
    Name string     `json:"name"`
    Brith time.Time `json:"brith"`
}

type JsonTime time.Time
// 实现它的json序列化方法
func (this JsonTime) MarshalJSON() ([]byte, error) {
    var stamp = fmt.Sprintf("\"%s\"", time.Time(this).Format("2006-01-02 15:04:05"))
    return []byte(stamp), nil
}
type Student1 struct {
    Name string     `json:"name"`
    Brith JsonTime  `json:"brith"`
}

type Student2 struct {
    Name string     `json:"name"`
    // 一定要将json的tag设置忽略掉不解析出来
    Brith time.Time  `json:"-"`
}
// 实现它的json序列化方法
func (this Student2) MarshalJSON() ([]byte, error) {
    // 定义一个该结构体的别名
    type AliasStu Student2
    // 定义一个新的结构体
    tmpStudent:= struct {
        AliasStu
        Brith string `json:"brith"`
    }{
        AliasStu:(AliasStu)(this),
        Brith:this.Brith.Format("2006-01-02 15:04:05"),
    }
    return json.Marshal(tmpStudent)
}


func main()  {
    stu:=Student{
        Name:"qiangmzsx",
        Brith:time.Date(1993, 1, 1, 20, 8, 23, 28, time.Local),
    }

    b,err:=json.Marshal(stu)
    if err!=nil {
        println(err)
    }

    println(string(b))//{"name":"qiangmzsx","brith":"1993-01-01T20:08:23.000000028+08:00"}


    println("===================")

    stu1:=Student1{
        Name:"qiangmzsx",
        Brith:JsonTime(time.Date(1993, 1, 1, 20, 8, 23, 28, time.Local)),
    }
    b1,err:=json.Marshal(stu1)
    if err!=nil {
        println(err)
    }

    println(string(b1))//{"name":"qiangmzsx","brith":"1993-01-01 20:08:23"}

    println("===================")
    stu2:=Student2{
        Name:"qiangmzsx",
        Brith:time.Date(1993, 1, 1, 20, 8, 23, 28, time.Local),
    }

    b2,err:=json.Marshal(stu2)
    if err!=nil {
        println(err)
    }

    println(string(b2))//{"name":"qiangmzsx","brith":"1993-01-01 20:08:23"}
}

It is worth mentioning that MarshalJSON , UnmarshalJSON , String methods are added to any struct to implement custom json output format and printing method.