Hi David,
like that. It sets a timestamp with the current system time:
![0EM50000000RsfZ.jpg 0EM50000000RsfZ.jpg](/t5/image/serverpage/image-id/13283i5FA290D4B7FC227E/image-size/large?v=v2&px=999)
But you should test it if it works in a form. Never tested it myself otherwise you can just build a Smart Campaign which triggers form submits and sets the datetime with the parameter, or you could use JavaScript. Maybe a other person tested it and can tell you which solution you should choose.
Best regards
Steffen