Question about single date item when exporting MARCXML

I am experimenting with exporting MARCXML from the resource records I create, with the hope that I can conform the data I input with catalogers' standards for MARC records. Most of the export looks okay--title maps to the 245 title, extent maps to 300 subfield a, etc. The problem I am seeing is with dates--If we are working with a single item, there is a conflict with the AT rules for these dates compared with the bibliographic format rules. For inclusive dates, AT requires that a beginning year and an ending year be entered, even though for an object there may be only one year. So, when the MARCXML is exported, the duplicate years both get put into the controlfield tag (008), and this goes against bib format standards because when there is a single date, it should only be entered once. [According to bib format standards, the only way the same date could be entered twice in the date fixed field (008) is if the bib level is collection or subunit.] Trying to get it to export correctly, I also tried entering the single date in only the date expression field, but when MARCXML is exported, the date only appears in the 245 $f, and not at all in the 008 field. Has anyone else had similar issues, and how have you solved it?