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How many seconds in 1 year?
The answer is 31556952.
We assume you are converting between second and Gregorian year.
You can view more details on each measurement unit:
seconds or year
The SI base unit for time is the second.
1 second is equal to 3.1688738506811E-8 year.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between seconds and years.
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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.
You can do the reverse unit conversion from year to seconds, or enter any two units below:
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.
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.
ag = a_g = 365.2425 days for the mean Gregorian year
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