“All You Zombies”
by Robert A. Heinlein
2217 Time Zone V (EST) 7 Nov. 1970–NTC-- “Pop’s Place”: I was polishing a brandy snifter when the Unmarried Mother came in. I noted the time—10:17 P. M. zone five, or eastern time, November 7th, 1970. Temporal agents always notice time and date; we must. The Unmarried Mother was a man twenty–five ye…