Writing value to a column only once on list item creation

Using just SharePoint 2010 and InfoPath (with no access to SharePoint Designer or workflows) can the following be achieved?

List Schema (Simplified):

  1. Action – Text Field
  2. Current Target Date – Date Field
  3. Original Target Date – Date Field

Requirement:

  1. Use an InfoPath form for entry, only presenting the user with “Action” and “Current Target Date” to populate.
  2. On record creation the value in “Current Target Date” is also written to “Original Target Date”
  3. Any further updates to “Current Target Date” would not change “Original Target Date”.

Thanks in advance for any help/advise provided.