在Go中解析奇数JSON日期格式

Question

I'm calling a older api, and its returning objects in the form of.

{ value: 1, time: "/Date(1412321990000)/" }

Using a struct defined with

type Values struct{
  Value int
  Time time.Time
}

Gives me a &time.ParseError. I'm a beginner at Go, is there a way for me to define how this should be serialized/deserialized?. Ultimately I do want it as a time.Time object.

This date format seems to be an older .NET format too. Can't really get the output changed either.

Answer 1

You need to implement the json Unmarshaler interface on your Values struct.

// UnmarshalJSON implements json's Unmarshaler interface
func (v *Values) UnmarshalJSON(data []byte) error {
    // create tmp struct to unmarshal into
    var tmp struct {
        Value int    `json:"value"`
        Time  string `json:"time"`
    }
    if err := json.Unmarshal(data, &tmp); err != nil {
        return err
    }

    v.Value = tmp.Value

    // trim out the timestamp
    s := strings.TrimSuffix(strings.TrimPrefix(tmp.Time, "/Date("), ")/")

    i, err := strconv.ParseInt(s, 10, 64)
    if err != nil {
        return err
    }

    // create and assign time using the timestamp
    v.Time = time.Unix(i/1000, 0)

    return nil
}

Check out this working example.