This legacy converter sends only the numeric value and selected units to UsefulUtilities for calculation. The local-first workbench tools are labelled separately.
Calculating…
Assumption: Calendar months have 28–31 days and leap years have 366 days. Use date-aware calendar arithmetic when actual start and end dates matter.
How it is calculated
Seconds through weeks use fixed SI-derived durations. This calculator defines a month as 30 days and a year as 365 days for arithmetic conversion.
Displayed results may be rounded. Verify safety-critical, regulated or high-precision work against the applicable standard and the precision required by your application.