Hello Monica,
This is from the release notes for QIP 65A:
Enhancements and Problems fixed in QI 6.5A (980615)
? A ".F" extension is available on date specification codes. The ".F" extension displays a 4 digit year on invoices and credit notes. For example, %E22.M %E22.D %E22.F prints as "Jan 1, 2000".