L 1011 going into service on 0 december 1973

Just ordered an L 1011. Delivery is on 1 December 1972, so that is fine.
On the aircraft's page it still says thoug that it's going to be launched at 0 december 1973

Happens sometimes when you delay delivery of individual planes they are then due for delivery on 0th of the month. Notice this as I don't have planes delivered between 11pm & 7am BST.

Strange.

In the past, if I deferred delivery two weeks from the 11th of the month, it will be delivered on the 0th day. However, I did it just recently in R2, and it correctly reflected the 1st of the month.

No, in the delivery menu it says it's going to be delivered on 1 December 1972, which is correct.
On the aircraft's own menu, it says it's going in production on 0 December 1973 (and production will end in the end of 1983, which I assume is correct)

Oops. Now I understand. Disregard my previous post.