Time & Duration Converter
Fast, bidirectional conversion of time intervals and chronological durations. Effortlessly calculate seconds in an hour, days in a month, or hours in a year.
Supported Time & Duration Units & Standards
Detailed definitions, unit symbols, and measurement systems for this category.
| Unit Name | Symbol | System | Description |
|---|---|---|---|
| Millisecond (Milliseconds) | ms | metric | One thousandth of a second. |
| Second (Seconds) | s | standard | The fundamental SI base unit of time. |
| Minute (Minutes) | min | standard | Equal to 60 seconds. |
| Hour (Hours) | h | standard | Equal to 60 minutes or 3,600 seconds. |
| Day (Days) | d | standard | Solar day defined as 24 hours (86,400 seconds). |
| Week (Weeks) | wk | standard | Standard calendar week consisting of 7 days (168 hours). |
| Month (Average) (Months) | mo | standard | Average Gregorian month equal to 30.436875 days (approx. 2.63 million seconds). |
| Year (Calendar) (Years) | yr | standard | Standard Gregorian year equal to 365.2425 days (approx. 31.56 million seconds). |
Popular Time & Duration Conversion Pairs
Browse dedicated conversion pages complete with snippet tables and formula explanations.
Time & Duration FAQ
Common questions about converting time & duration units.
What units are supported in the Time & Duration converter?
Unitly supports 8 distinct time & duration units: Millisecond (ms), Second (s), Minute (min), Hour (h), Day (d), Week (wk), Month (Average) (mo), Year (Calendar) (yr).
How does Unitly ensure accurate time & duration calculations?
All calculations are executed client-side using NIST-calibrated constants and IEEE-754 precision filters to eliminate floating-point artifacts.
Can I convert backwards or swap units?
Yes! Click the quick-swap button (⇄) or simply edit either the "From" or "To" field directly for instant bidirectional calculation.