something like this could work (if current time falls between 07:00PM and 07:00AM - formula return true)

 formatDate(Current Time,'HH')*60 +formatDate(Current Time,'mm')*1 < 7*60 &&  formatDate(Current Time,'HH')*60 +formatDate(Current Time,'mm')*1 > 19*60‍

Excellent thank you.  I have entered it to see if it does the trick.  Thank you kindly.

I am super curious what kind of form requires this type of validation! Is it like an IT support form? (No need to answer if you don't want, I just have never seen a button reject me if it's 2AM before...)

We have remote agents that need to address form submissions in as close to realtime as possible (under 20 minutes).  However, we only have agents available for 12 hours a day.  Otherwise the endusers need to contact onsite support by another method.  

I did not want end users submitting the form when it is unmonitored, and bypassing their onsite support.  I put instructions on the form, but we found that users were submitting forms during off hours and expecting someone to be answering it.

Hey ‌ -- did ‌'s solution work out for you? 

It did. I did think I marked as helpful/solved.

Solution works great. I actually wanted the opposite effect so I just had to change the times but it worked no issue. Thank you.