Only L lenses have date code, the 85 f/1.8 is not and L lens. However new Canon L lenses like some of the later copies of the 70-200 f/2.8 L IS II and the 70-300 f/4-5.6L IS don't have date code at all.
Only L lenses have date code, the 85 f/1.8 is not and L lens. However new Canon L lenses like some of the later copies of the 70-200 f/2.8 L IS II and the 70-300 f/4-5.6L IS don't have date code at all.