The Weather's Fine

"The Westher's Fine" is a short story by Harry Turtledove, Playboy, 7/87; Kaleidoscope, Del Rey 1990; 3 X T, Baen 2004. It is a science fiction tale where time has become something like the weather; when its in the 60s outside, for example, it means that the world and the people in it adopt the styles and trends of the 1960s.