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Currently it's possible to select a fixed minimum and maximum date range for a DateTime parameter.  (Or at least so the documentation says; it didn't work when I tried it, but then I didn't try very hard.)

It's also possible to provide an Available Values query for one (non-DateTime) parameter that is dependent on another -- for example, after you select a value for Category it will show the list of possible SubCategories for that category.

It would be nice if this sort of thing could be used for DateTime parameters as well, perhaps in one or both of the following ways:

  • A dataset that returns one row with specific column names for min/max datetimes.
  • A dataset that returns a single column with many rows, each one a valid datetime (thereby allowing "holes" in the calendar).
Interestingly, it does appear to be almost possible to do the latter already, but this results in a regular combo list instead of a calendar control.  (It also throws an exception if you attempt to sort at the parameter level.)