Un any natural gregorià té 365,2425 dies:
1 year = 365.2425 days = (365.2425 days) × (24 hours/day) × (3600 seconds/hour) = 31556952 seconds
Un any astronòmic julià té 365,25 dies:
1 year = 365.25 days = (365.25 days) × (24 hours/day) × (3600 seconds/hour) = 31557600 seconds
Un any natural comú té 365 dies:
1 common year = 365 days = (365 days) × (24 hours/day) × (3600 seconds/hour) = 31536000 seconds
Un any natural de traspàs té 366 dies (ocorre cada 4 anys):
1 leap year = 366 days = (366 days) × (24 hours/day) × (3600 seconds/hour) = 31622400 seconds
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