On Fr, 2020-08-28 at 09:06 +0200, Andreas Pirklbauer wrote:

    > Moving fast lets you sleep longer. It does not     > let you today attend tomorrow's dinner.

From my point of view your clock is ticking slower and still shows Aug 28, so my today is your yesterday.. 

Well, this is true for both of you: the well-known "twin paradox". BUT: Either you or Wojtek must have accelerated in the past, and this will make the difference of who is really ahead in time. This seems to mutate to a physics mailing list... ;-) Hellwig