Time Unit Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks, months, and years instantly.
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Milliseconds
3,600,000 ms
Seconds
3,600 s
Minutes
60 min
Hours
1 h
Days
0.041667 day
Weeks
0.005952 week
Months
0.001369 month
Years
0.000114 year
Frequently Asked Questions about the Time Unit Converter
Which year length does this converter use?
We use the average Gregorian year (365.2425 days = 31,556,952 seconds). It accounts for leap years on average, including the rule that skips three leap days every 400 years.
What is the difference between a Julian year and a Gregorian year?
A Julian year is exactly 365.25 days (31,557,600 seconds). A Gregorian year averages 365.2425 days because it skips three leap days every 400 years. The difference is about 11 minutes per year, negligible for everyday conversion.
Why is one month set to 2,629,746 seconds?
That value equals one average Gregorian year divided by 12 (roughly 30.44 days). Calendar months actually range from 28 to 31 days, so this average is the only sensible constant for unit conversion.
How are leap years handled?
The Gregorian year already averages in one leap day every four years, minus three leap days every 400 years (0.2425 extra days per year on average). You don't need to add anything manually for typical conversions.
Why don't my 30 days = 1 month calculations match?
Because 30 days is a common shortcut, not the actual average. One month here is roughly 30.44 days, so 30 days converts to about 0.9863 months.