InfoPath Dev

It can't submit an event. The infopath form was published successfully. "The validation formula has evaluated to an error." pop up while submitting an event.

From select General Settings-->Form settings-->Use the default Sharepoint form (Select Delete the InfoPath Form from the server) -->OK. Open New Item. It opens a weir form with End Date Time on top. Try to fill out the weir form, -->Save. Error message "The validation formula has evaluated to an error." again. Can someone help with this crazy error? thanks a lot.

I've not seen this. Can you try creating a new Calendar and see if it reproduces? Can your SharePoint admin check the ULS logs?

Correct the validation settings. The event was saved without error. But the event was not displaying for the Start Date/End Date, it showing on the created date, why?

So - the same issue occurs in a new list? If you look in the list data, do you see data in the start / end fields?

I did recreate a new calendar, and it works fine. thank you.

I can recreate a new calendar. My question is: How do I change the background of it?

What do you want to change the background of? Can you attach a screenshot under the Options tab in a reply to show me?