The text associated with this span is a date. At least one of the arguments TtsSpan.ArgMonth and TtsSpan.ArgYear has to be provided. The argument TtsSpan.ArgDay is optional if TtsSpan.ArgMonth is set. The argument TtsSpan.ArgWeekday is optional if TtsSpan.ArgDay is set. Also accepts the arguments TtsSpan.ArgGender, TtsSpan.ArgAnimacy, TtsSpan.ArgMultiplicity and TtsSpan.ArgCase.