Time converter

convert time, duration, second, minute, hour, day, month, year © FreeSoulProduction Fotolia This converter allows you to simultaneously convert a duration in several common time units like second (base unit of time in the International System of units - SI), minute, hour, day, week, month, year.

1 tropical year= 365.24149135 days = 12 months, 1 week = 7 days, 1 day = 24 hours, 1 hour = 60 minutes, 1 minute = 60 seconds, 1 second = 1000 milliseconds

Enter the duration in the second column of the following array and the conversion will be performed automatically in all other units.

Year Day Hour Minute Seconde ms
millisecond ms
second s
minute mn
hour h
day d
week
sideral lunar month
synodic lunar month
30 days month
month
365 days year
tropical year y

Interval between two dates

This part allow you to compute duration between two date and reverse, adding or remove a duration from a reference date (which is by default today)
The duration between these two dates will be the one in the first table

Duration before a reference date

Date before
Reference Date

Duration after a référence date

Reference Date
Date After

Note

The period of time during which the Earth completes one rotation with respect to the Sun is called a day. It is 86400 seconds.
A tropical year is the time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth, it is 365.24149135 days.
As this value is nearly 365.2425 days it was decided that some civil years have 366 days every 4 years except every 100 years (1900 was not a bissextile year) except every 400 year (2000 was a leap year).
Several definitions exist for a lunar month depending on the reference used.
On dates, the reference date is computed according to your local timezone. But duration computations are done regardless daylight saving time .
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