Check if two datetimes are between two others Today I'm facing with problem, which I can't solve.

I need to check if two datetimes (2019-04-08 13:30:00 - 2019-04-08 15:30:00 ) are between or overlap two others (2019-04-08 14:00:00 - 2019-04-08 16:00).

Imagine that those datetimes are event's date. We can see that there is an event between 14:00 and 16:00 so we cant' have other between. 

I've tried something like this: 

SELECT * FROM Rezerwacja WHERE
(('2019-04-08 13:30:00.000' between Start and Stop) OR
('2019-04-08 15:30:00.000' between Start and Stop))


How to check if there is an "event" already ?
To check for overlaps, you only need 2 conditions, the start or interval A with the end of interval B, and vice versa:

WHERE
      '2019-04-08 13:30:00.000' &lt; Stop 
  AND Start &lt; '2019-04-08 15:30:00.000'