Conversions
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?
The converter uses the average Gregorian year: 365.2425 days, or exactly 31,556,952 seconds. That average already accounts for the standard leap-year rules, including the century-year exception that drops 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), assuming one leap day every four years without exception. The Gregorian calendar skips three of those leap days each 400-year cycle, giving an average of 365.2425 days (31,556,952 seconds). The gap is about 10 minutes and 48 seconds per year, which is negligible for everyday time conversions.
Why is one month set to 2,629,746 seconds?
That figure is one average Gregorian year divided by 12 (31,556,952 / 12), which works out to roughly 30.436875 days. Calendar months run from 28 to 31 days, so a single fixed value is the only practical constant for unit conversion.
How are leap years handled?
Leap years are baked into the year constant itself. The 31,556,952-second year already averages in the extra day every four years and the three skipped days every 400 years. No manual adjustment is needed for typical conversions.
Why don't my 30 days = 1 month calculations match?
30 days is a rough shortcut, not the true average. The converter treats one month as about 30.4369 days, so 30 days works out to about 0.9856 months, close but not equal.