I have no idea, but your sentence is not correct.
It could be "I haven't seen Uncle Andy since just after Christmas." If it were "on Christmas Day", a different sentence would be required.
Student or Learner
Yesterday we had a listening test at school and there was a sentence "I haven't seen uncle Andy just after Christmas".
The question was "When has the speaker seen uncle Andy last time?"
I thought that it was on Christmas day. Is that right?
Thank you. Your sentence is correct, I just forgot about 'since'. Now everything is clear.
Last edited by Rover_KE; 01-Dec-2014 at 18:26. Reason: Deleting unnecessary quote.