Unless I tell it to. "Supergirl" airs at 8 next Sunday, not 9. I had already set two programs to record next Sunday, one of which was supposedly "Supergirl" which I have a season pass for. But the listings had changed. I was looking up something else and discovered "Crisis on Infinite Earths" in the normal "Supergirl" slot. I had expected this might happen which is why I checked the listings earlier. But "Supergirl" was an hour earlier and when I selected it, it said "Record this episode", not "Modify recording". This is strange.