Time Converter - Convert Time Units

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Unit	Value	Actions
scientific year
second s
millisecond ms
microsecond µs
nanosecond ns

Unit	Value	Actions
julian year
gregorian year
month (30 days) mo
week wk
day d
hour h
minute min

Unit	Value	Actions
anomalistic year
sidereal year
stellar year
tropical year

Common mistakes in time conversion

The '30-day month' is a bookkeeping convention, real months run 28 to 31 days. A year is about 365.24 days, not 12 × 30 = 360, so the convention loses more than five days per year. Use it for rough estimates, but switch to real calendar dates when accuracy matters.
A year is not exactly 52 weeks: 365 days is 52 weeks plus one day, and a leap year 52 weeks plus two. That extra day is why the same date shifts one weekday each year. When spreading a yearly amount per week, use 52.18 weeks per year.
Decimal hours are easily misread as hours and minutes: 1.5 hours is 1 hour 30 minutes, not 1 hour 50. The decimal part is a fraction of an hour, so multiply it by 60: 0.1 h = 6 min and 0.25 h = 15 min. A timesheet's 7.75 h means 7 h 45 min.
There are several year definitions: the Julian year is exactly 365.25 days, the Gregorian calendar year 365.2425, and the tropical year about 365.2422 days. For everyday use the differences are negligible, but they matter in astronomy, the light-year, for instance, is defined using the Julian year.

Quick conversion quiz

Score: 0

9.6 second equals 9.6e+3 millisecond.

Correct answer: 9.6 second = 9.6e+3 millisecond.

53 second equals 5.3e+4 millisecond.

Correct answer: 53 second = 5.3e+4 millisecond.

14.9 second equals 0.248 minute.

Correct answer: 14.9 second = 0.248 minute.

Definitions

second (s)

The SI base unit of time. Defined by atomic transitions.

The second (symbol: s) is the base unit of time in the International System of Units (SI). Since 1967, it has been defined by the fixed numerical value of the cesium frequency, the unperturbed ground-state hyperfine transition frequency of the cesium-133 atom.

julian year

Exactly 365.25 days. Used in astronomy.

A Julian year (symbol: a) is a unit of measurement of time defined as exactly 365.25 days of 86,400 SI seconds each. It is the standard unit used by astronomers to define the light-year.

gregorian year

Standard calendar year, 365.2425 days.

The Gregorian year is the average length of the year in the Gregorian calendar. It is exactly 365.2425 days, accounting for leap year rules where years divisible by 100 are not leap years unless they are also divisible by 400.

day (d)

Exactly 86,400 seconds.

A day is a unit of time defined as exactly 86,400 seconds. It is accepted for use with the SI, although the actual rotation of the Earth can vary slightly (monitored via leap seconds).

hour (h)

60 minutes or 3,600 seconds.

The hour (symbol: h) is a unit of time equal to 60 minutes, or 3,600 seconds. It is a non-SI unit accepted for use with the SI units.

minute (min)

60 seconds.

The minute is a unit of time equal to 60 seconds. It is a non-SI unit accepted for use with the SI units.

anomalistic year

365.2596 days.

An anomalistic year is the time it takes Earth to travel from its closest point to the Sun (perihelion) and back to perihelion again, lasting approximately 365.2596 days (or 365 days, 6 hours, 13 minutes, 53 seconds). This period is slightly longer than other year definitions (like the tropical year or sidereal year) because the Earth's elliptical orbit slowly shifts, a phenomenon called apsidal precession, causing the perihelion point to move eastward.

Frequently asked questions

How many seconds are in a day?

A day has 86,400 seconds (24 × 60 × 60).

How many minutes are in a day?

A day has 1,440 minutes (24 × 60).

How many hours are in a week?

A week has 168 hours (7 × 24).

How many minutes are in a week?

A week has 10,080 minutes (7 × 24 × 60).

How many seconds are in a year?

A common year (365 days) has 31,536,000 seconds. A leap year (366 days) has 31,622,400 seconds.

Why can time conversions be tricky for months?

Months vary between 28 and 31 days, so converting “months” to days or hours depends on the specific month(s) involved.

How do I use the time converter on konvertera.nu?

Enter the time amount, choose the unit you have (like hours), choose the unit you want (like minutes), and the converter shows the result.

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