I'm not sure which needs to be merged into which, but I would like to request that the date-range and daterange tags be merged.
Personally, I'm a fan of hyphens, so I'd like to see date-range stick around, but whatever floats your boat.
Actually, 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.
1 year ago