Created a form with a Timestamp.

We have created a form with a timestamp, using LiveCycle Designer. When someone submits this form the time and date are accurate enough to when they emailed or saved the document.

We then add some additional information on this form and save it.

Our time and date field is changing when we do this.

Is it possible to have a time and date field that only gets populated when it is first saved or emailed?

Thanks in advance.