Time Converter


*Precision level 10e-7.

A. Time Conversion

Time is a measure of the duration of events and the intervals between them. The basic unit of time is the second, with smaller units including the Millisecond, Microsecond, Nanosecond, Picosecond, Femtosecond, and Attosecond. Larger units of time include the Minute, Hour, Day, Week, Month, Year, Decade, Century, and Millennium. These units are used universally across various fields such as science, engineering, and everyday life.

B. How to Use Time Converter

You can use the keyboard to input numbers and arithmetic operators:

0 1 2 3 4 5 6 7 8 9 . keys can be used to input numbers.

+ - ( ) keys can be used to input arithmetic operators for advanced conversions.

Use this time converter to convert between different units of time.

C. Metric System (SI Units) - Time Conversion Table

Unit Conversion Description
Second Base unit of time The standard unit of time.
Millisecond 0.001 seconds One thousandth of a second.
Minute 60 seconds Time it takes for Earth's rotation to advance by a minute.
Hour 60 minutes Time it takes for Earth to complete one rotation (relative to the Sun).
Day 24 hours Time it takes for Earth to complete one full rotation on its axis.
Week 7 days A typical period for one full cycle of human work/rest time.
Month 30.44 days (approx.) The average length of a lunar cycle.
Year 12 months Time it takes Earth to complete one orbit around the Sun.
Decade 10 years A period of 10 Earth orbits around the Sun.
Century 100 years A period of 100 Earth orbits around the Sun.
Millennium 1000 years A period of 1000 Earth orbits around the Sun.
Microsecond 1e-6 seconds A time interval shorter than a blink of an eye.
Nanosecond 1e-9 seconds A time interval smaller than the speed of light can travel in a nanosecond.
Picosecond 1e-12 seconds A time interval that could pass unnoticed even by the fastest human reactions.
Femtosecond 1e-15 seconds A time scale where molecular reactions occur.
Attosecond 1e-18 seconds A time scale for phenomena occurring within atoms or electrons.

D. Other Unit System - Time Conversion Table

Unit Conversion Description
Shake 10 nanoseconds A unit of time used in nuclear physics, equal to 10 nanoseconds.
Month Synodic 29.53059 days The average period of the Moon's orbit with respect to the line joining the Sun and Earth.
Year Julian 365.25 days A year in the Julian calendar, consisting of 365.25 days.
Year Leap 366 days A leap year in the Gregorian calendar, consisting of 366 days.
Year Tropical 365.2422 days The time it takes the Earth to complete one orbit around the Sun, relative to the vernal equinox.
Year Sidereal 365.25636 days The time it takes the Earth to complete one orbit around the Sun, relative to fixed stars.
Day Sidereal 23 hours, 56 minutes, 4.1 seconds The time it takes for the Earth to rotate once relative to the fixed stars.
Hour Sidereal 3590.17 seconds 1/24th of a sidereal day.
Minute Sidereal 59.836 seconds 1/60th of a sidereal hour.
Second Sidereal 0.99726957 seconds 1/60th of a sidereal minute.
Fortnight 2 weeks A period of two weeks.
Septennial 7 years A period of seven years.
Octennial 8 years A period of eight years.
Novennial 9 years A period of nine years.
Quindecennial 15 years A period of fifteen years.
Quinquennial 5 years A period of five years.
Planck Time 5.39e-44 seconds The time it takes for light to travel one Planck length.
Lustrum 5 years A period of five years.
Olympiad 4 years A period of four years, associated with the Olympic Games.
Tritade 3 years A period of three years.
Quadrennium 4 years A period of four years.
Lunar Month 29.53059 days The average time between successive new moons.
Lunar Year 12 Lunar Months The time it takes for the Moon to complete 12 lunar months.
Draconic Year 346.6 days The time it takes for the Moon to return to the same node of its orbit.
Gaussian Year 365.2422 days The time it takes for a planet to complete one orbit around the Sun, assuming a circular orbit.
Heliacal Year 365.2422 days The time it takes for the Sun to return to the same position relative to the fixed stars.
Saros 18 years, 11 days, and 8 hours A period of approximately 18 years, 11 days, and 8 hours, used to predict eclipses.
Exeligmos 3 Saros cycles A period of three Saros cycles, used to predict eclipses.
Octaeteris ±8 years A period of ±8 years or 99 month synodic, used in ancient Greek calendars.
Enneadecaeteris (Metonic) ±19 years A period of ±19 years or 235 month synodic, used to predict the phases of the Moon in ancient Greek calendars.
Callippic Period ±76 years A period of ±76 years or 940 month synodic, used in ancient Greek calendars.
Hipparchic Cycle ±345 years A period of ±345 years or 4267 month synodic, used in ancient Greek calendars.
Sothic Period 1460 years A period of 1460 years, used in ancient Egyptian calendars.

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