Could you give me a couple of examples of the input strings you have in mind ?
(2 or 3 (from -> to)
examples ?)
I'm finding here, for example that with the closing parenthesis,
@due(tomorrow)
converts to
@due(2020-11-28)
while (dec 10)
converts to (2020-12-10)
both without a trailing time-string,
but perhaps the typical input string that you have in mind is slightly different ?