Purpose

You want to find all objects with some date range (two dates) - such as an event start and end - inside the range of a query-start and query end?
Example: You want all events within a date range of next two weeks, neither if the event has started one week ago nor ends one week later - or both?
Take this index. Take this index. Its possibly the fastest way to solve the problem, it solves it as an index and works direct with the catalogs fast
IISets. Its much faster than classical catalog-query post-processing.
IOW: The index acts as an proxy for a more complex query on two DateIndexes. It utilize the other indexes and does not store any index-data
itself!

Dependencies

• Zope 2.9.x or 2.10.x
• might work also with 2.8.x and former versions (untested)
  

Installation

Old-school Zope 2 Product:

• Place all in your "Products" directory.
• Add the index as usal (ZMI, code, profile, ...)