Override the layout used by json.Marshal to format time.Time

Question

In Golang, is there a way to make the generic encoding/json Marshal to use a different layout when Marshaling the time.Time fields?

Basical

Answer 1

Maybe something like this will work for you?

package main

import "fmt"
import "time"
import "encoding/json"

type jsonTime struct {
t time.Time
f string
}

func (j jsonTime) MarshalText() ([]byte, error) {
return []byte(j.t.Format(j.f)), nil
}

func main() {
x := map[string]interface{}{
    "foo": jsonTime{t: time.Now(), f: time.Kitchen},
    "bar": "baz",
}
data, err := json.Marshal(x)
if err != nil {
    panic(err)
}
fmt.Printf("%s", data)
}

also available here: http://play.golang.org/p/D1kq5KrXQZ

Just make a custom type that implements MarshalText the way you want it to show up.