How do you check schedule windows coherence?

Hi all, 

I wonder if you have any method (script, Opscenter query) to check if there is any mismatch between "Start Window" and "Calendar schedule".

For example if I set calendar schedule to saturday but you select a window on friday from 17 to 19, that job will never run, even if one thinks it's running fine.

I'm still trying to find a way to discover such situation in large environment.

How do you solve this problem?