I think Monday should be the new date night. It gives people something to look forward to once the weekend is over. Only problem is there are fewer option as most New York restaurants are closed Mondays.
If I could go back in time it would be to Friday and I would do that over and over again. Since I was a little kid I enjoyed the feeling of Friday, even as I got older and had to work the weekends I still looked forward to Friday. It felt like more fun is had on Fridays.