May 25, 2024

XKCD Web Comic #1061: EST (described)

A web comic of romance,
sarcasm, math, and language.


xkcd presents

Earth Standard Time


A Universal Calendar for a Universal Planet

EST is. . .

Simple – Clearly Defined – Unambiguous – Free of Historical Baggage – Compatible with Old Units – Precisely Synced with the Solar Cycle – Free  0f Leap Years – Intermittently Amenable to Date Math



Second: 1 SI Second

Minute: 60 Seconds

Hour: 60 Minutes

Day: 1444 Minutes (24 hours 4 minutes

Month: 30 Days

Year: 12 Months


For 4 hours after every full moon, run clocks backward.

The non-prime-numbered minutes of the first full non-reversed hour after a solstice or Equinox happen twice.

Epoch00:00:00 EST      January 1, 1970  =00:00:00 GMT, January 1, 1970   (Julian Calendar) Time ZonesThe two EST Time Zones are                   EST and EST (United Kingdom)These are the same except that the           UK second is 0.9144 Standard Seconds

Daylight Saving: Countries may enter DST, but no time may pass there.

Narnian Time: Synchronized (check)

Year Zero: EST does have a year 0 (However, there is no 1958.)

Hover text: The month names are the same, except that the fourth month only has the name “April” in even-numbered years, and is otherwise unnamed.


Warning: This comic occasionally contains strong language (which may be unsuitable for children), unusual humor (which may be unsuitable for adults), and advanced mathematics (which may be unsuitable for liberal-arts majors).

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