Originally Posted by
AF680
Experienced exactly the same problem a few months ago: you need to understand "May 31" as "friday-evening-wich-is-before-May-31, business hours" so in this case May 30 4 pm...
So I called them the day after and they allowed me to book at the promo rate without problem.

Perfect!

I'll give them a call in the morning. Glad I didn't wait til this evening to book. Thanks,
AF680!