So one of the many assumptions about the Parallel Time Line was that the Flight (815) perhaps landed the same day as Flight 815 was supposed to land.
However, if you look closely at Claire's ultrasound of Aaron you will see the date of 10-22-04. A month later?? At least the year is confirmed as 2004.
Also thought the "Angel of Mercy" hospital was interesting.
NOTE: Some have pointed out that there is a "D" which could represent "Due Date". Also apparently Gregg Nations has confirmed that part of the date is correct and part is not, but we have to guess what part.
Here is the screencap:
Source: The ODI