Check if an event falls within or overlaps another, calculate difference

[123CaM321]

I have 2 tables. Both record events. Each table has an ON date/time and an OFF date/time column along with a description of an event. Lets call these tableA and tableB respectively.

I'd like to make a new column in tableA. How can I take each tableA event and see if it falls within or overlaps any part of an event inside tableB. If it falls within the event I'd return a 0 to the new column, else I'd calculate the time it overlaps and add that as a number to the new column

These tables have no relation other than the ON and OFF columns are both Date/time formats.

Is this possible?

[lbendlin]

Please provide sample data that covers your issue or question completely, in a usable format (not as a screenshot).
https://community.powerbi.com/t5/Community-Blog/How-to-provide-sample-data-in-the-Power-BI-Forum/ba-...
Please show the expected outcome based on the sample data you provided.

https://community.powerbi.com/t5/Desktop/How-to-Get-Your-Question-Answered-Quickly/m-p/1447523