About Time Tools

Time Tools is built and maintained by the FastTools4U team, a small independent group that builds free, no-nonsense browser tools. We are not a large company — just a handful of people who kept opening the same three tabs to convert an epoch value, check what time a call was in another country, and count the working days left in a sprint.

The site collects five date and time utilities: a bidirectional Unix timestamp converter with a live clock, a date difference calculator, a multi-zone timezone converter, a live countdown timer, and a working days calculator that excludes weekends and your own holiday list. All five run entirely in your browser.

Our Philosophy

Every tool on this site runs client-side. There is no backend that stores your dates, no account to create, and no analytics profile built from what you type. Schedules and deadlines can be commercially sensitive — the date of an unannounced launch, the length of a contract, the timing of a negotiation — and the simplest way to keep that private is to never receive it. When you close the tab, the values are gone, because they only ever existed in your own browser's memory.

Getting Timezones Right

Most quick timezone converters add or subtract a fixed number of hours, which quietly breaks around daylight saving transitions and for the zones that use half-hour or quarter-hour offsets. We take a different approach: a single instant in time is formatted with the browser's built-in Intl API against a named IANA timezone such as America/New_York or Asia/Kolkata. The browser ships with the same timezone database that operating systems use, so the offset applied is the one that was actually in force on that date — daylight saving included.

Honest About Edge Cases

Calendar arithmetic is full of traps, and we would rather explain them than pretend they do not exist. Months have different lengths, so "one month later" is not a fixed number of days. Leap years break naive division. A day is not always twenty-four hours long in a zone that observes daylight saving. Each tool page describes what convention it follows and where a different tool might legitimately give a different answer.

Why It's Free

Time Tools is part of the FastTools4U network of independent tool sites, hosted on static infrastructure that costs very little to run. The site is supported by display advertising, which lets us keep every tool free with no usage limits and no premium tier. We have no plans to change that.

Feedback

If you spot a wrong conversion, want another tool added, or just want to say the site was useful, visit our Contact page — we read every message.