How Can I Customize Timestamp Formatting in Go's JSON Responses?

Formatting Timestamps in JSON Responses

Go's time package provides a time.Time type for representing timestamps. However, when encoding a time.Time object to JSON using json.NewEncoder, it is formatted in a machine-friendly format. If you wish to customize the timestamp format in JSON responses, employ the following steps:

Customizing Timestamp Format

Create a custom type that embeds time.Time and implements the Marshaler interface.

type JSONTime time.Time

func (t JSONTime) MarshalJSON() ([]byte, error) {
    stamp := fmt.Sprintf("\"%s\"", time.Time(t).Format("Mon Jan _2"))
    return []byte(stamp), nil
}

This code defines a type that formats the timestamp as "Mon Jan _2".

Using Custom Time Type

In your Document struct, use the JSONTime type for the timestamp field:

type Document struct {
    Name        string
    Content     string
    Stamp       JSONTime
    Author      string
}

Sample Code

Initialize the Document with your custom timestamp:

testDoc := model.Document{"Meeting Notes", "These are some notes", JSONTime(time.Now()), "Bacon"}    

Now, you can send the response with the custom timestamp format:

sendResponse(testDoc, w,r)

Note:

Alternatively, you can use a library like timelib to easily customize timestamp formats. It provides a MarshalJSON method for time.Time values.

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