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Time Units
Convert online metric Time Units measurement using this tool.

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How to use Time Units Converter
Enter the value to convert from into the input box on the top. Select the unit to convert from in the left units list. Select the unit to convert to in the right units list. Click 'Convert' button then the conversion result will immediately appear in the output box.

### Popular Units

 Unit Symbol Definition Conversion to SI units atomic unit of time au = a0/(a·c) ~ 2.418 884 254 x 10-17 s Callippic cycle = 441 mo (hollow) + 499 mo (full) = 76 a of 365.25 d = 2.398 3776 x 109 s century c = 100 a (see below for definition of year length) = 100 x year day d = 24 h = 86400 s day (sidereal) d = Time needed for the Earth to rotate once around its axis, determined from successive transits of a very distant astronomical object across an observer's meridian (International Celestial Reference Frame) ~ 86 164.1 s decade dec = 10 a (see below for definition of year length) = 10 x year fortnight fn = 2 wk = 1 209 600 s helek = 1/1 080 h = 3.3 s Hipparchic cycle = 4 Callippic cycles - 1 d = 9.593 424 x 109 s hour h = 60 min = 3 600 s jiffy j = 1/60 s = .016 s jiffy (alternate) ja = 1/100 s = 10 ms ke (quarter of an hour) = ¼ h = 1/96 d = 60 x 60 / 4 s = 900 s = 60 / 4 min = 15 min ke (traditional) = 1/100 d = 24 x 60 x 60 / 100 s = 864 s = 24 * 60 / 100 min = 14.4 min lustre; lustrum = 5 a of 365 d = 1.5768 x 108 s Metonic cycle; enneadecaeteris = 110 mo (hollow) + 125 mo (full) = 6940 d ~ 19 a = 5.996 16 x 108 s millennium = 1 000 a (see below for definition of year length) = 1000 x year milliday md = 1/1 000 d = 24 x 60 x 60 / 1 000 s = 86.4 s minute min = 60 s, due to leap seconds sometimes 59 s or 61 s, = 60 s moment = 90 s = 90 s month (full) mo = 30 d = 2 592 000 s month (Greg. av.) mo Average Gregorian month = 365.2425/12 d = 30.436875 d ~ 2.6297 x 106 s month (hollow) mo = 29 d = 2 505 600 s month (synodic) mo Cycle time of moon phases ~ 29.530589 days (Average) ~ 2.551 x 106 s octaeteris = 48 mo (full) + 48 mo (hollow) + 3 mo (full) = 8 a of 365.25 d = 2922 d = 2.524 608 x 108 s Planck time = (G?/c5)½ ~ 1.351 211 868 x 10-43 s second s time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 K (but other seconds are sometimes used in astronomy) (SI base unit) shake = 10-8 s = 10 ns sigma = 10-6 s = 1 µs Sothic cycle = 1 461 a of 365 d = 4.607 4096 x 1010 s svedberg S = 10-13 s = 100 fs week wk = 7 d = 604 800 s year (Gregorian) a, y, or yr = 365.2425 d average, calculated from common years (365 d) plus leap years (366 d) on most years divisible by 4. See leap year for details. = 31 556 952 s year (Julian) a, y, or yr = 365.25 d average, calculated from common years (365 d) plus one leap year (366 d) every four years = 31 557 600 s year (sidereal) a, y, or yr = time taken for Sun to return to the same position with respect to the stars of the celestial sphere ~ 365.256 363 d ~ 31 558 149.7632 s year (tropical) a, y, or yr = Length of time it takes for the Sun to return to the same position in the cycle of seasons ~ 365.242 190 d ~ 31 556 925 s Where UTC is observed, the length of time units longer than 1 s may increase or decrease by 1 s if a leap second occurs during the time interval of interest.
source: wikipedia

### Convert From and To Units

 • 1/3 Year • Atomic unit of time • Beat • Blink • Century • Cosmic year • Day (d, da) • Fortnight • Francaide • Glass • Hour (h, hr) • Kilosecond • Lustrum • Megasecond (Ms) • Microsecond (µs) • Millenium • Millisecond (ms, msec) • Minute (min) • Nanosecond (ns) • Pikosecond • Quarter Hour • Second (s, sec) • Shake • Split second • Ten Years • Thousand Year • Watch • Week (wk) • Year