The Senate came this close to getting the date right. SB387 was amended to affect guns made from October 22, 1968 onward. That's the day the Gun Control Act was signed, but not the day it became effective. That was December 16, 1968.One version says pre-1968 guns are ok but ignores the guns actually made in 1968, another version gives the exact date in 1968 the GCA became effective.