Hello Sailor, I have understood that your cookie lives for ten hours at client side starting from the server's time of sending. That's why IE refuses it if the local time is after that time.
By the way, I think it is not a bug of IE, it is a design of IE no mater how it is, good or bad.
I tried to modify some words I posted and enabled my browser to receive Cookie, but the return message said I did not enable the Cookie. Why?