Updated API Guide?

Is there an updated guide or resource that is more accurate?

I'm running into constant issues with info provided in the API guide and support answers with very non-answer asking for screenshots etc.

I.e.
-List All Users
--Query (An optional value to filter the projects by name and address line 1)
---I'm not filtering projects
--modified_since (An ISO8601 formatted date and time to return projects modified on or after the provided value)
---On another record type this is actually required in EPOCH format. But I'm not able to get this one to work in either.

-List Projects
--Query (An optional value to filter the projects by name and address line 1)
---This flat out does not work. I've tried every variation of line one and name
--modified_since (An ISO8601 formatted date and time to return projects modified on or after the provided value)
---On another record type this is actually required in EPOCH format. In Epoch format, I get a server error. In ISO8601 it does not work.

-List Photos

start_date (An ISO8601 formatted date and time to return projects modified on or after the provided value)
-- Says ISO8601 but is actual EPOCH

I've spent days trying to work through this stuff and am currently hung on the modified_since info on projects and users.