At the end of his almost finished poem John Shade (the poet in VN's novel Pale Fire, 1962) says that he is reasonably sure that he will wake at six tomorrow, on July the twenty-second:
I'm reasonably sure that we survive
And that my darling somewhere is alive,
As I am reasonably sure that I
Shall wake at six tomorrow, on July
The twenty-second, nineteen fifty-nine,
And that the day will probably be fine;
So this alarm clock let me set myself,