Date type XML marshalling

types/date.go

@@ -2,6 +2,7 @@ package types
 
 import (
 	"encoding/json"
+	"encoding/xml"
 	"time"
 )
 
@@ -29,6 +30,23 @@ func (d *Date) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+func (d Date) MarshalXML(encoder *xml.Encoder, start xml.StartElement) error {
+	return encoder.EncodeElement(d.Time.Format(DateFormat), start)
+}
+
+func (d *Date) UnmarshalXML(decoder *xml.Decoder, start xml.StartElement) error {
+	var dateStr string
+	if err := decoder.DecodeElement(&dateStr, &start); err != nil {
+		return err
+	}
+	parsed, err := time.Parse(DateFormat, dateStr)
+	if err != nil {
+		return err
+	}
+	d.Time = parsed
+	return nil
+}
+
 func (d Date) String() string {
 	return d.Time.Format(DateFormat)
 }

types/date_test.go

@@ -2,6 +2,7 @@ package types
 
 import (
 	"encoding/json"
+	"encoding/xml"
 	"fmt"
 	"testing"
 	"time"
@@ -32,6 +33,29 @@ func TestDate_UnmarshalJSON(t *testing.T) {
 	assert.Equal(t, testDate, b.DateField.Time)
 }
 
+func TestDate_MarshalXML(t *testing.T) {
+	testDate := time.Date(2019, 4, 1, 0, 0, 0, 0, time.UTC)
+	b := struct {
+		DateField Date `xml:"date"`
+	}{
+		DateField: Date{testDate},
+	}
+	xmlBytes, err := xml.Marshal(b)
+	assert.NoError(t, err)
+	assert.Equal(t, `<date>2019-04-01</date>`, string(xmlBytes))
+}
+
+func TestDate_UnmarshalXML(t *testing.T) {
+	testDate := time.Date(2019, 4, 1, 0, 0, 0, 0, time.UTC)
+	xmlStr := `<date>2019-04-01</date>`
+	b := struct {
+		DateField Date `xml:"date"`
+	}{}
+	err := xml.Unmarshal([]byte(xmlStr), &b)
+	assert.NoError(t, err)
+	assert.Equal(t, testDate, b.DateField.Time)
+}
+
 func TestDate_Stringer(t *testing.T) {
 	t.Run("nil date", func(t *testing.T) {
 		var d *Date