Personally, I'm a fan of hyphens, so I'd like to see date-range stick around, but whatever floats your boat.
closed as off-topic by CRABOLO, Aziz Shaikh, animuson♦, Martijn Pieters, rene Nov 24 '14 at 11:01
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DateRange is a C#/.NET class. That is why daterange is used in How to know if a DateTime is between a DateRange in C#. I would rather not use date-range for questions about the class.