I'm always getting unable to send message because of invalid date format. See below

I wrote
when:Sunday October 9, 2011 at 6:00 AM

And got back
Invalid value given for the date: "Sunday October 9, 2011 at 6:00 AM"

I wrote
when:Thursday October 13, 2011 at 6:00 AM

and got
Invalid value given for the date: "Thursday October 13, 2011Â at 6:00 AM"

Please let me know correct formats.

You can see the bad characters in your string. You likely are copying and pasting from a richtext field that has some formatting characters in there. Try typing the dates manually:

Sunday 6am
Oct 13 6am

This isn't helping me. I've tried every combination I can think of. I still get a "fail" and the message that my date is invalid. I've tried "now," "2 minutes," the date and time: 6/2/2012 3:24 PM, etc.

What could I be missing?

You also can't have any blank fields. For example if you don't have any cc: options, then omit that line completely. Have you tried that?