Anything that supports a sort of activity can do this already.

?sort=activity&min={start-date}&max={end-date}

Where start-date and end-date are unix timestamps.

Anything that supports a sort of activity can do this already.

?sort=activity&min={start-date}&max={end-date}

Where start-date and end-date are unix timestamps.

Update

/questions and /questions/unanswered now honor min, max, and order.

sort     | min and max limit
--------------------------------
active   | last_activity_date
newest   | creation_date
featured | bounty_closes_date*
hot      | last_activity_date
week     | last_activity_date
month    | last_activity_date
votes    | score

todate and fromdate, as always, limit creation_date.

_{*bounty_closes_date is always in the future, as featured only returns those questions whose bounties haven't passed yet.}