Automatically put date on a submitted post

Hi ..

Loving your plugin...

I'm using your form together with WordPress custom post types. People can submit some post fields and then I show them on the website as "events"..

Here is the form - http://www.xn--kibk-xoa.com/aktivitetskalender
(in danish, but you get the picture ;-))

All events have a date and time, and I set WP up to show posts that have a scheduled date in future.. People pick the data, and write the time in a "custom field"..

Is there any easy way to put the date and time on the post that are submitted...
At the moment I go in and set it up with a WordPress post manually... I would like that to happen by auto...

Possible ?

Best regards
Brian

Ps... loving the new user registration add on...