Recurring theme:

June 19, 1999

Doctor Sleep

The date Dick Halloran dies.

The Dark Tower VII: The Dark Tower

The day Jake and Stephen King save Stephen King's life.

11/22/63

The date that the Vermont Yankee nuclear reactor exploded.

The Dark Tower VI: Song of Susannah

Stephen King awakens from a dream and realizes he's written in his dreambook: “6/19/99, O Discordia.” He is later hit by a van and killed in Lovell, Maine on this date.