Sep 1, 1991Derived chronology
Harry begins Hogwarts
Harry’s first school year begins on September 1, following the novels’ reconstructed chronology.
Sources: J. K. Rowling, Harry Potter and the Philosopher's Stone. London: Bloomsbury, 1997.
Fictional Worlds
Explore how time passes in nine fictional universes: their calendars, histories and extraordinary rules of time.
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Earth-like time
Hogwarts
Harry Potter
The school of witchcraft and wizardry lives by ordinary British clocks and the school year.
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Variable time
Narnia
The Chronicles of Narnia
Time in Narnia runs at no fixed rate relative to ours: a year at home can be centuries there.
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A different calendar
Middle-earth
The Lord of the Rings
The hobbits of the Shire use their own calendar with twelve 30-day months and special holidays.
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A different calendar
Star Wars
Star Wars
Galactic history is dated before and after the Battle of Yavin, not by a live Earth clock.
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A different calendar
Dune
Frank Herbert’s Dune
An Imperial calendar spans millennia, using the foundation of the Spacing Guild as its reference.
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A different calendar
Star Trek
Star Trek · Prime timeline
Explore Earth’s future and the Federation through historical years, rather than an invented present-day stardate.
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Time dilation
Interstellar
Interstellar · 2014
Near a black hole, time slows down: on Miller's planet one hour equals about seven years far away.
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Time loops
Groundhog Day
Groundhog Day · 1993
February 2 repeats while Phil’s memories, skills and subjective experience keep accumulating.
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Time travel
Doctor Who
Doctor Who · BBC
The Doctor travels through past, present, distant futures and alternative histories in a nonlinear personal order.
Explore : Doctor Who