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Gregorian year Julian year tropical year sidereal year anomalistic year draconic year lunar year Gaussian year |
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How many year in 1 second?
The answer is 3.1688738506811E-8.

We assume you are converting between **Gregorian year** and **second**.

You can view more details on each measurement unit:

year or
second

The SI base unit for **time** is the second.

1 year is equal to 31556952 second.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between years and seconds.

Type in your own numbers in the form to convert the units!

You may also want to find out how many days
are between two dates on the calendar. Use the
**date calculator**
to get your age in days or measure the duration of an event.

1 year to second = 31556952 second

2 year to second = 63113904 second

3 year to second = 94670856 second

4 year to second = 126227808 second

5 year to second = 157784760 second

6 year to second = 189341712 second

7 year to second = 220898664 second

8 year to second = 252455616 second

9 year to second = 284012568 second

10 year to second = 315569520 second

You can do the reverse unit conversion from second to year, or enter any two units below:

year to millennium

year to day

year to month

year to week

year to hour

year to decade

year to nanosecond

year to minute

year to quarter

year to fortnight

An average Gregorian year is 365.2425 days (52.1775 weeks, 8765.82 hours, 525949.2 minutes or 31556952 seconds). For this calendar, a common year is 365 days (8760 hours, 525600 minutes or 31536000 seconds), and a leap year is 366 days (8784 hours, 527040 minutes or 31622400 seconds). The 400-year cycle of the Gregorian calendar has 146097 days and hence exactly 20871 weeks.

a_{g} = a_g = 365.2425 days for the mean Gregorian year

The second (symbol s) is a unit for time, and one of seven SI base units. It is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom at zero kelvins.

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