Who knows whether some things are inclusive or not? Who knows what use dates and timestamps? It seems like this should be abstracted somewhere and this knowledge codified in one single place. It sounds like your abstraction, in this case, isn't very abstract at all.

That is common for bad abstractions -- they add a layer but they don't actually encapsulate any knowledge. To use this abstraction, you shouldn't be passing any flags for inclusive/exclusive, etc -- it should know that for you.