Time Converter
Convert between 10 time units, from milliseconds to centuries, with live results and the exact factor shown. Months and years use average lengths.
How time conversion works
All units convert through seconds. Fixed units (minutes, hours, days, weeks) are exact; months and years use average lengths (1 month = 30.44 days, 1 year = 365.25 days) because calendar months and leap years vary.
Average month and year
A year averages 365.25 days to account for leap years, and a month is 1/12 of that (30.436875 days). For exact calendar math between two dates, use a date calculator instead.