Make NewCommonAttributes public

date.go

@@ -19,7 +19,7 @@ func DateTime(t time.Time) string {
 // NewDate creates a new Date. It returns a *Date.
 func NewDate(t time.Time) *Date {
 	return &Date{
-		CommonAttributes: newCommonAttributes(),
+		CommonAttributes: NewCommonAttributes(),
 		DateTime:         DateTime(t),
 	}
 }