add json marshalers to CborTime

testing/roundtrip_test.go

@@ -2,6 +2,7 @@ package testing
 
 import (
 	"bytes"
+	"encoding/json"
 	"math/rand"
 	"reflect"
 	"testing"
@@ -146,4 +147,18 @@ func TestTimeIsh(t *testing.T) {
 		t.Fatal("no")
 	}
 
+	b, err := json.Marshal(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var out2 ThingWithSomeTime
+	if err := json.Unmarshal(b, &out2); err != nil {
+		t.Fatal(err)
+	}
+
+	if out2.When != out.When {
+		t.Fatal(err)
+	}
+
 }

utils.go

@@ -739,3 +739,16 @@ func (ct *CborTime) UnmarshalCBOR(r io.Reader) error {
 func (ct CborTime) Time() time.Time {
 	return (time.Time)(ct)
 }
+
+func (ct CborTime) MarshalJSON() ([]byte, error) {
+	return ct.Time().MarshalJSON()
+}
+
+func (ct *CborTime) UnmarshalJSON(b []byte) error {
+	var t time.Time
+	if err := t.UnmarshalJSON(b); err != nil {
+		return err
+	}
+	*(*time.Time)(ct) = t
+	return nil
+}