Time Converter

How Time Converter works

Convert time between milliseconds, seconds, minutes, hours, days, weeks, months and years. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

Seconds as the base

All eight units are defined in seconds, which makes conversions exact except for months and years — those use averages, because calendar units are not fixed lengths.

A month here is 2,629,800 s (30.4375 days) and a year is 31,557,600 s (365.25 days). Those are averages across the Gregorian cycle, not the length of any particular month or year.

Calendar units are not arithmetic

Adding “one month” to 31 January is ambiguous: most systems land on 3 March or 28 February depending on the rule. Converting days to months with the average factor gives 30.44 days per month, which is right on average and wrong for any specific month.

For contracts and deadlines, use calendar arithmetic (the date difference tool) rather than a unit conversion.

Milliseconds and long spans

Milliseconds matter for performance work: a 250 ms budget is 0.25 s, and a 3,000 ms timeout is 3 s. At the other end, converting years to seconds is mostly a curiosity — but it is how cache lifetimes and token expiries are sometimes specified.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions