Board Thread:The Reference Desk/@comment-60605-20140919101627/@comment-4139960-20140919200635

Bwburke94 wrote: Clara was actually eight months behind the viewers at the start of Series 8. But that's beside the point.

Only if you can conclusively say that narratively The Day of the Doctor, which features Kate Stewart (not to mention, among other things, The Power of Three taking place over a year between July and July), is in 2013 and The Time of the Doctor is Christmas 2013. Seeing as Strax identifies her age as 27 (I think Bells or Akhaten or both insinuate she's 24 in 2013) in Deep Breath.