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Calendar family

Computer & Digital

The time machines actually keep: epoch counts, standards, and one failed attempt at a world without time zones.

4 counts

Atomic Time (TAI)

International Atomic Time · 37 seconds ahead of UTC

ISO 8601 Week Date

International standard · week-numbered

Swatch Internet Time

1,000 .beats a day · one world, no time zones (1998)

Seconds since 1 Jan 1970, UTC · itself a running clock