Convert between seconds, minutes, hours, days, weeks, months and years, plus the sidereal and lunar cycles, the fortnight and score, and historical units such as the lustrum, Hindu ghati and Maya tun.
Months and years are not constant. This site uses the average Gregorian year of 365.2425 days, so one 'year' converts to 365.2425 days, not 365; use 'common year' for exactly 365 days.