Time Converter
Convert any duration between twelve units of time, from nanoseconds to centuries. Enter a value, choose the units, and the result updates as you type.
0.0027397260274
1 Day = 0.0027397260274 yr
About this tool
Seconds, minutes and hours are fixed: 60 seconds make a minute, 60 minutes an hour and 24 hours a day. A week is always seven days. Months and years are the only units that vary in real calendars, so this converter uses the everyday convention of a 365-day year divided into twelve equal months of 30.42 days.
Sub-second units follow the metric prefixes: a millisecond is a thousandth of a second, a microsecond a millionth and a nanosecond a billionth. They matter in programming, where timeouts are written in milliseconds and CPU operations are measured in nanoseconds.
Frequently asked questions
- How many seconds are in a day?
- 86,400. That is 24 hours × 60 minutes × 60 seconds.
- How many hours are in a week?
- 168 hours: 7 days × 24 hours.
- How long is a month in this converter?
- One twelfth of a 365-day year, or about 30.42 days. Real months range from 28 to 31 days, so use a date calculator when the exact calendar matters.
- Does a year count as 365 or 365.25 days?
- 365 days, the everyday convention. Astronomers use the 365.25-day Julian year; the difference is 0.07%.