Initially I exported the data from Rootsmagic to a GEDCOM and then imported as a new tree to FTM. I input some new data and only found out about the quarter date problem when I used the sort by date of birth in the index. (I had far too many people with no date of birth). At this point I exported to a new GEDCOM created by FTM, modified and then re-imported. I think you have answered the question. I was concerned that the export-modify-import might lose data.