How to determine if a date range occurs any time within another date range?

Question

I have an Event table that specifies a date range with start_date and end_date fields. I have another date range, specified in code, that defines the

Answer 1

(end2 >= start1) && (start2 <= end1) I think would return true for any intersecting date ranges.

I found a discussion about this here that I found useful.