A record exists of when your engine/transmission assembly was built, but not of when it was installed in a vehicle chassis. Depending on which assembly where your car was built and the proximity of the model year Job #1 date to when that occurred, the gap in time between engine/transmission manufacture and vehicle build could range from two weeks to two months.
If your car has any of its original glass, the dates on the trademark will at least give you a big clue as to when it wasn't built as it could have been built in the latest of those months' dates (if more than one date exists on your original glass), but not before. Even then. it is more likely to have been built in the month following the latest date on the glass.