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A day is a unit of time. In common usage, it is either an interval equal to 24 hours or daytime, the consecutive period of time during which the Sun is above the horizon. The period of time during which the Earth completes one rotation with respect to the Sun is called a solar day. Several definitions of this universal human concept are used according to context, need and convenience. In 1960, the second was redefined in terms of the orbital motion of the Earth, and was designated the SI base unit of time. The unit of measurement "day", redefined in 1960 as 86,400 SI seconds and symbolized d, is not an SI unit, but is accepted for use with SI. A civil day is usually 86,400 seconds, plus or minus a possible leap second in Coordinated Universal Time (UTC), and occasionally plus or minus an hour in those locations that change from or to daylight saving time. The word day may also refer to a day of the week or to a calendar date, as in answer to the question "On which day?" The life patterns of humans and many other species are related to Earth's solar day and the day-night cycle.

In recent decades the average length of a solar day on Earth has been about 86,400.002 seconds and there are about 365.242 2 solar days in one mean tropical year. Because celestial orbits are not perfectly circular, and thus objects travel at different speeds at various positions in their orbit, a solar day is not the same length of time throughout the orbital year. A day, understood as the span of time it takes for the Earth to make one entire rotation with respect to the celestial background or a distant star (assumed to be fixed), is called a stellar day. This period of rotation is about 4 minutes less than 24 hours (23 hours 56 minutes and 4.1 seconds) and there are about 366.242 2 stellar days in one mean tropical year (one stellar day more than the number of solar days). Mainly due to tidal effects, the Earth's rotational period is not constant, resulting in further minor variations for both solar days and stellar "days". Other planets and moons have stellar and solar days of different lengths to Earth's.

Symbol/abbreviation: day
Unit of: TIME
TIME's base unit: seconds (SI Unit)
In relation to the base unit (seconds), 1 Days = 86400 seconds.
[Conversion table] 1 Days (day) to all time units
1 day= 2.7397260274E-12 aeons (eon)
1 day= 3.57189476334E+21 atomic unit of time (au)
1 day= 8.64E+22 attoseconds (as)
1 day= 3.60243524623E-5 callippic cycles (cali)
1 day= 2.7393785669E-5 centuries (cent)
1 day= 1 days (day)
1 day= 0.00027393785669 decades (dec)
1 day= 8.64E-14 exaseconds (Es)
1 day= 8.64E+19 femtoseconds (fs)
1 day= 0.0714049586777 fortnights (fn)
1 day= 1.1911852293E-11 galactic years (gal)
1 day= 8.64E-5 gigaseconds (Gs)
1 day= 0.00273790700699 gregorian years (GY)
1 day= 25920.02592 helek (h)
1 day= 9.00616922592E-6 hipparchic cycles (HC)
1 day= 24 hours (hr)
1 day= 1.1911852293E-11 indictions (in)
1 day= 5184000.00207 jiffies (jiffy)
1 day= 96 ke (ke)
1 day= 86.4 kiloseconds (Ks)
1 day= 0.00273224043716 leap years (ly)
1 day= 0.0338631906248 lunar months (lm)
1 day= 0.000547945205479 lustrums (L)
1 day= 0.0864 megaseconds (Ms)
1 day= 0.00014409221902 metonic cycles (mc)
1 day= 86400000000 microseconds (µs)
1 day= 2.7393785669E-6 millenniums (mill)
1 day= 1000 millidays (md)
1 day= 86400000 milliseconds (ms)
1 day= 1440 minutes (min)
1 day= 960 moments (moment)
1 day= 0.0328767123288 months (mo)
1 day= 8.64E+13 nanoseconds (ns)
1 day= 0.000342231348392 octaeteris (octa)
1 day= 0.000684462696783 olympiads (o)
1 day= 8.64E-11 petaseconds (Ps)
1 day= 8.64E+16 picoseconds (ps)
1 day= 1.60260869081E+48 planck times (tp)
1 day= 86400 seconds (s)
1 day= 8.64E+12 shakes (shake)
1 day= 1.00273779915 sidereal days (Sd)
1 day= 0.0027378031145 sidereal years (Sy)
1 day= 86400000000 sigmas (Sigma)
1 day= 1.87524026516E-6 sothic cycles (Sc)
1 day= 8.64E+17 svedbergs (S)
1 day= 8.64E-8 teraseconds (Ts)
1 day= 0.00273790931092 tropical years (TY)
1 day= 0.142857142857 weeks (wk)
1 day= 0.0027397260274 years (yr)
1 day= 8.64E+28 yoctoseconds (ys)
1 day= 8.64E-20 yottaseconds (Ys)
1 day= 8.64E+25 zeptoseconds (zs)
1 day= 8.64E-17 zettaseconds (Zs)
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