Yesterday
  Whence?
  An Interactive Fiction
  Release 1 / Serial number 150512 / Inform 7 build 6M22 (I6/v6.33 lib 6/12N) SD
  
  Yesterday
  Nearby a temporal vortex leads west.
  
> >   Yesterday
  (Testing.)
  
  >[1] w
  
  Today
  Nearby a temporal vortex leads east to Yesterday.
  
  >[2] e
  
  Yesterday
  Nearby a temporal vortex leads west to Today.
  
> >