Weren't there some fans that thought that they messed up and that S3 was supposed to be in 2411, not 2401? I could be mistaken but I seem to recall something along those lines.
The theory was that “Frontier Day” was originally supposed to be the 250th anniversary of the founding of the Federation in 2161, which would have been 2411. This makes total sense. Having Frontier Day instead be about the launching of the NX-01 while that ship was sitting neglected in the museum while the celebration was taking place in Earth orbit made zero sense. Add to that the aforementioned issues with Jack’s age and Seven’s time on the Titan shows that something changed in post-production.