About Unitime

Unitime is a small, focused collection of online calculators for dates, times, and everyday unit conversions.

Every tool is free, needs no account, and opens straight into a working form — there is no tour to skip and nothing to buy.

Correctness first. Each tool states the rule it applies, so you can see how a result was produced and where its limits are.

Simple by design. Open a tool and start straight away — no account, no extra steps in the way.

Always improving. We keep refining the tools people use most, so the ones you rely on keep getting better.

Every tool page is written around the rule the calculation applies, not around keywords. The formula, the rounding, and the cases the tool does not handle are stated on the page, so a result can be checked rather than taken on trust.

Where a rule differs by country or calendar — business days, public holidays, US and Imperial measures — the page names the version it uses. The guides are checked against the same sources as the tools and updated when a rule changes.

Unitime is a set of calculators, not a source of professional advice. Results are not legally, financially, or medically authoritative.

Date and time zone results follow the IANA time zone database as implemented by your browser. They are not a replacement for a scheduling system that has its own holiday and business-day rules.

Unitime is supported by advertising, and that is what keeps every tool free and open to everyone.

Ad units are kept visually separate from the controls and are never placed between your input and your result. The Privacy Policy explains how advertising and measurement work on the site.