Free tools for time & dates

Free Online Time & Date Calculators

TimeKit is a collection of free, easy-to-use time and date tools that run entirely in your browser. No account needed, no data stored, no fees — ever. Whether you need to find your exact age, count the days between two deadlines, set a live countdown to an event, track your weekly work hours, or convert a meeting time across continents, TimeKit gives you the answer in seconds.

Every tool on TimeKit is built with a single goal: answer your question quickly, without clutter. There are no forced sign-ups, no popups, and no paid tiers. The same tools work equally well on a phone, tablet, or desktop — and because all the logic runs locally in your browser, every tool continues to work even without an internet connection once the page has loaded. Use them on a plane, on the underground, or anywhere with no signal.

How each tool works

Age Calculator

The Age Calculator takes your date of birth and tells you exactly how old you are — not just in years, but in years, months, days, weeks, hours, and minutes. It also shows how many times your heart has beaten and how many breaths you have taken since you were born, based on average physiological rates. An animated progress bar shows how far you are through your current year of life, and the tool counts down the days to your next birthday. The background theme changes automatically based on your hemisphere and the current season — spring greens, summer sky blues, autumn ambers, or winter cool tones.

The most common reasons people use an age calculator include passport and visa applications (where exact age in years and months is required), school and college admission forms, government job eligibility checks, voter ID registration, senior citizen benefit claims, and medical history forms. The tool handles leap years and varying month lengths correctly so the result is always accurate.

Date Difference Calculator

The Date Difference Calculator tells you how many days fall between any two dates. A toggle lets you switch between counting all calendar days and counting only working days (Monday to Friday), which is useful when you are tracking a project deadline, calculating a notice period, or working out how many business days remain before a contract milestone. The tool works across any date range — past or future — so you can measure how long ago something happened just as easily as how long until something occurs.

Countdown Timer

The Countdown Timer shows a live, ticking countdown to any date you choose — displaying days, hours, minutes, and seconds in real time. It includes a set of preloaded India festival and event presets (such as Diwali, Holi, and Republic Day) that appear automatically when the tool detects an Indian locale, alongside other globally relevant presets. You can type in any custom event name and date to create a personalised countdown for a wedding, exam, flight, or project launch.

Time Zone Converter

The Time Zone Converter covers 81 cities across every major time zone worldwide. Enter a time in any city and instantly see what that moment looks like in every other city on your list. The converter automatically adjusts for Daylight Saving Time (DST), so the result is always correct even during transition weekends when some regions shift clocks and others do not. Popular route presets — such as New York to London, Mumbai to Dubai, and Sydney to Singapore — let frequent travellers and remote teams get results with a single click. You can also compare multiple time zones side by side to find the overlap window that works for a cross-continental meeting.

Work Hours Calculator

The Work Hours Calculator lets you enter clock-in and clock-out times for each day of the week, along with a break duration. It calculates total hours worked per day, flags any overtime beyond a threshold you set, and totals up your gross weekly pay based on an hourly rate you provide. It is useful for freelancers tracking billable hours, employees verifying a timesheet, or managers doing a quick payroll sanity check before submitting to HR.

Frequently asked questions

Is TimeKit completely free?

Yes. All five tools are free to use with no sign-up, no subscription, and no hidden charges. TimeKit is supported by unobtrusive display advertising.

Does TimeKit store my data?

No. All calculations happen locally in your browser using JavaScript. Your date of birth, clock-in times, or any other input you enter is never sent to a server and is never stored anywhere.

How does the Age Calculator handle leap years?

The calculator correctly accounts for leap years. February 29 birthdays are handled by treating the anniversary as February 28 in non-leap years for the purpose of counting complete years, which is the standard convention used by most legal and government systems.

Why does the Age Calculator background change colour?

The sky gradient on the Age Calculator reflects the current season in your hemisphere. If you allow location access, the tool detects whether you are in the northern or southern hemisphere and applies the matching season. You can also choose a season manually from the controls below the sky banner.

How accurate is the Time Zone Converter for Daylight Saving Time?

The converter uses your browser's built-in time zone data, which is kept current by your operating system. This means DST transitions are handled correctly for all 81 supported cities, including regions that observe non-standard DST dates such as the United States, the European Union, Australia, and Brazil.

Can I use TimeKit on my phone?

Yes. Every tool is fully responsive and works on any screen size. There is no app to install — just open the website in any mobile browser and the layout adjusts automatically.

What is the difference between calendar days and working days in the Date Difference Calculator?

Calendar days counts every day between the two dates, including weekends and public holidays. Working days counts only Monday to Friday, skipping Saturdays and Sundays. The working days toggle is useful when you need to calculate a business notice period, a contract delivery window, or an official processing timeline.

How does the Work Hours Calculator handle overnight shifts?

If your clock-out time is earlier than your clock-in time (for example, you start at 10 PM and finish at 6 AM), the calculator treats it as a shift that crosses midnight and adds 24 hours to the clock-out time to compute the correct duration.

Can I add TimeKit to my home screen?

Yes. On an iPhone or iPad, open the site in Safari, tap the Share button, and choose "Add to Home Screen." On Android, open the site in Chrome, tap the three-dot menu, and choose "Add to Home Screen." This creates a shortcut that opens TimeKit full-screen like a native app.

Which cities are covered in the Time Zone Converter?

The converter includes 81 cities spanning every inhabited time zone, from Honolulu (UTC−10) through to Auckland (UTC+13). The full list covers major hubs across North America, South America, Europe, Africa, the Middle East, South Asia, Southeast Asia, East Asia, and the Pacific. Popular combinations such as IST ↔ EST, GMT ↔ CET, and SGT ↔ AEST are available as one-click presets.