Merge pull request #31 from goccy/feature/fix-encoding-for-time-type

Fix encoding for time type

encode.go

@@ -8,6 +8,7 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/goccy/go-yaml/ast"
 	"github.com/goccy/go-yaml/internal/errors"
@@ -151,6 +152,9 @@ func (e *Encoder) encodeValue(v reflect.Value, column int) (ast.Node, error) {
 			if mapItem, ok := v.Interface().(MapItem); ok {
 				return e.encodeMapItem(mapItem, column)
 			}
+			if t, ok := v.Interface().(time.Time); ok {
+				return e.encodeTime(t, column), nil
+			}
 		}
 		return e.encodeStruct(v, column)
 	case reflect.Map:
@@ -342,6 +346,11 @@ func (e *Encoder) isZeroValue(v reflect.Value) bool {
 	return false
 }
 
+func (e *Encoder) encodeTime(v time.Time, column int) ast.Node {
+	value := v.Format(time.RFC3339Nano)
+	return ast.String(token.New(value, value, e.pos(column)))
+}
+
 func (e *Encoder) encodeStruct(value reflect.Value, column int) (ast.Node, error) {
 	node := ast.Mapping(token.New("", "", e.pos(column)), e.isFlowStyle)
 	structType := value.Type()

encode_test.go

@@ -6,6 +6,7 @@ import (
 	"math"
 	"strconv"
 	"testing"
+	"time"
 
 	"github.com/goccy/go-yaml"
 )
@@ -291,6 +292,20 @@ func TestEncoder(t *testing.T) {
 			"v: あいうえお\nv2: かきくけこ\n",
 			map[string]string{"v": "あいうえお", "v2": "かきくけこ"},
 		},
+
+		// time value
+		{
+			"v: 0001-01-01T00:00:00Z\n",
+			map[string]time.Time{"v": time.Time{}},
+		},
+		{
+			"v: 0001-01-01T00:00:00Z\n",
+			map[string]*time.Time{"v": &time.Time{}},
+		},
+		{
+			"v: null\n",
+			map[string]*time.Time{"v": nil},
+		},
 	}
 	for _, test := range tests {
 		var buf bytes.Buffer