Add errors.go

Signed-off-by: Vartan Benohanian <vartanbeno@gmail.com>

util.go

@@ -7,6 +7,8 @@ import (
 	"reflect"
 )
 
+var timestampType = reflect.TypeOf(Timestamp{})
+
 // String is a helper routine that allocates a new string value
 // to store v and returns a pointer to it.
 func String(v string) *string {
@@ -91,6 +93,12 @@ func stringifyStruct(w io.Writer, v reflect.Value) {
 		_, _ = w.Write([]byte(v.Type().String()))
 	}
 
+	// special handling of Timestamp values
+	if v.Type() == timestampType {
+		fmt.Fprintf(w, "{%s}", v.Interface())
+		return
+	}
+
 	_, _ = w.Write([]byte{'{'})
 
 	var sep bool