(richTTDate: any2stringadd[RichTTDate]).+(other)
(richTTDate: Ordered[RichTTDate]).<(that)
(richTTDate: Ordered[RichTTDate]).<=(that)
(richTTDate: Ordered[RichTTDate]).>(that)
(richTTDate: Ordered[RichTTDate]).>=(that)
(richTTDate: Ordered[RichTTDate]).compare(that)
(richTTDate: Ordered[RichTTDate]).compareTo(that)