Year Duration Reference
Look up the exact duration of any Gregorian calendar year in days, hours, minutes, and seconds.
Duration summary
Unit breakdown
Calendar facts
Year type comparison
About Years4U
Years4U is a free reference tool for looking up the duration of any year in the Gregorian calendar. Data is calculated in accordance with ISO 8601 and the standard Gregorian calendar rules: a year is 365 days, except leap years which are 366 days.
A year is a leap year if it is divisible by 4, except for century years, which must be divisible by 400.
Data source: Gregorian calendar standard (ISO 8601). No external API required.