Sunday dinner deal?

This is an ad found in the Metro-North Railroad New Rochelle timetable, effective January 14, 1996 thru March 23, 1996.
The coupon for 15% off Sunday dinner is "valid through 9/30/94" and the schedule was printed January 14, 1996.
Hmm, it would seem there is a wee bit of a problem if we run the math.
Now if I only had a time machine. . .