[UnoriginalGuy]

I used to own a D-Link DIR-655. It had a hilariously terrible bug: It had a scheduler built in, so you could set WiFi to turn off overnight, amongst other things.

The scheduler web interface would only accept a range in the same 24 hr day, if you tried to set it to e.g. start (WiFi off) at 11 pm and stop (WiFi on) at 5 am, it refused with an error (paraphrasing) "end time must be after begin time."

It was ONLY a JavaScript issue. You could trivially bypass it using a developer bar, and it worked perfectly. But they never fixed the JavaScript in all the years I owned it (and I doubt it is fixed right now today).