What are all the units for time?

Answer 1

Name of time unit, t Symbol Definition Relation to SI unit s second s - second = SI base unit Planck time - ≡ √(Gℏ/c5) ≈ 1.351 211 818×10−43 s atomic unit of time au ≡ a0/(α•c) ≈ 2.418 884 254×10−17 s svedberg S ≡ 10−13 s = 100 fs shake - ≡ 10−8 s = 10 ns sigma - ≡ 10−6 s = 1 μs jiffy - ≡ 1/60 s ≈ 16.666 667 ms jiffy (alternate) - ≡ 1/100 s ≈ 10 ms helek - ≡ 1/1080 h ≈ 3.333333 s minute min ≡ 60 s moment - ≡ 90 s ≡ 90 s ke (traditional) - ≡ 1/100 d ≡ 864 s quarter (of an h) ke ≡ 1/96 d ≡ 900 s hour h ≡ 60 min = 3600 s day d ≡ 24 h = 86 400 s week wk ≡ 7 d = 604 800 s fortnight - ≡ 2 wk = 1 209 600 s month (hollow) mo ≡ 29 d = 2 505 600 s month mo ≡ 30 d = 2 592 000 s month (full) mo ≡ 31 d = 2 678 400 s year (Calendar) a or y ≡ 365 d = 31 536 000 s year (Gregorian) a or y ≡ 365.2425 d = 31 556 952 s year (Julian) a or y ≡ 365.25 d = 31 557 600 s sideral year a or y ≡ 365.256363 d = 31 558 149.76 s Olympiad - ≡ 4 a of 365 d = 1.2614×108 s lustre; lustrum - ≡ 5 a of 365 d = 1.5768×108 s octaeteris - ≡ 8 a of 365 d = 2.522 88×108 s decade - ≡ 10 a of 365 d = 3.1536×108 s enneade caeteris; Metonic cycle - ≡110 mo (hollow) + 125 mo (full) = 19 a of 365 d = 5.996 16×108 s Callippic cycle - ≡441 mo (hollow) + 499 mo (full) = 76 a of 365.25 d = 2.398 377 6×109 s century (Calendar) - ≡ 100 a of 365 d = 3.1536×109 s century (Julian) - ≡ 100 a of 365.25 d = 3.155 76×109 s Hipparchic cycle - ≡ 4 Callippic cycles - 1 d = 9.593 424×109 s millennium (Calendar) - ≡ 1000 a of 365 d = 3.1536×1010 s millennium (Gregorian) - ≡ 1000 a of 365.2425 d = 3.155 695 2×1010 s millennium (Julian) - ≡ 1000 a of 365.25 d = 3.155 76×1010 s Sothic cycle - ≡ 1461 a of 365 d = 4.607 409 6×1010 s