Moving the dates allowed me to get the payment page to load.

https://www.etihadairways.com/payment/pay

Since the Etihad booking page doesn't bring up a message about dates exceeding 330 days into the future, just keep the booking window limit in mind - when you get an error message like the one in my first post!


Interestingly the website doesn't black out the 330+ day dates, which I would have expected would avoid this problem.
FlyerTalk tip (this thread from MileageAddict): use this site for working out +330 days for bookings or -330 days for redemptions!

http://www.timeanddate.com/date/dateadd.html


Does the redemption booking system have the same problem? It doesn't black out the dates either.

Cheers, Bizi.