Civil, 24-hour
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Your local wall clock. What the microwave says.
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Swatch Internet Time
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Introduced 1998 by Swatch. 1000 beats per day, reckoned from Biel Mean Time (UTC+1). Time zones cancelled.
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French Revolutionary Decimal
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Adopted 5 October 1793, mandatory 24 November. 10 hours per day, 100 minutes per hour, 100 seconds per minute. Repealed 7 April 1795 for being annoying.
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Apparent Sidereal Time (Greenwich)
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Time by the stars. 23h 56m 4.0905s per rotation. What a telescope drive tracks.
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Unix Epoch Seconds
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Seconds since 00:00:00 UTC on 1 January 1970. Signed 32-bit variants overflow on 19 January 2038 at 03:14:07 UTC.
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Julian Date (UT)
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Days since noon UT on 24 November 4714 BC (proleptic Gregorian). Used by astronomers to avoid every calendar reform ever made.
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Discordian
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Year Of Our Lady of Discord (YOLD) = Gregorian + 1166. Five seasons of 73 days: Chaos, Discord, Confusion, Bureaucracy, The Aftermath.
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Mars Coordinated Time (Airy)
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A Martian sol is 24h 39m 35.244s. MTC is Mars's UTC, reckoned from Airy Crater at 0° longitude. The clock every rover mission scales from.
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This Session
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Elapsed since {{name}} opened this page. Reset by reloading.
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