Nine tools to measure, set, and count time

Your device timezone

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Shown from your device clock.Compare with server time

No install or sign-up needed. Settings and records are mainly stored on this device; shared links can include selected settings.

What time is it

Check the current time and verify whether your own device clock is actually right.

Online Clock72 citiesCurrent time, fullscreen, and world city comparison Server Time / Ticketingtime comparisonCompare time differences using server responses

Measure time

Record time as it passes, or get an alert once a set duration runs out.

Stopwatchlap exportMeasure elapsed time with hundredths-of-a-second display and export your laps.TimerpresetsSet a countdown for any duration Pomodoro25/525-min focus, 5-min break productivity technique Interval TimerTabataRepeating interval timer for workouts & study Multi Timer10 at onceRun multiple timers simultaneously

Mark the moment

Ring at a set time, or count the days left until a specific date.

Online Alarm Clockmulti-alarmSet alarms for any time D-day Countdownlunar datesCount days until important dates

How this site is built

Instead of a feature list that could belong to any site, here is what actually holds true.

Your records stay on this device

Timer settings, stopwatch laps, alarms, and Pomodoro stats live in browser storage only. There is no account and no login, and clearing site data removes them.

Built by someone who uses it

Run by one person. Each tool exists because the operator needed it daily and kept fixing what annoyed them. The tool copy and all 20 guides are written in-house.

Tool first, explanation second

Open a page and the tool is right there, working. Instructions and background sit below it so they never block the thing you came for.

The limits are written down too

Close the browser tab and the alarm will not ring; per-site server time resolves only to the second. Those limits are stated plainly in each tool's FAQ.

What is Clock-Tani?

Clock-Tani is a free online time tools platform that provides all the time-related tools you need in one website. From world clocks to stopwatches, timers, Pomodoro, alarms, and D-Day counters — all 9 tools are available instantly in your browser without any installation.

Built for students, professionals, fitness enthusiasts, home cooks, and anyone who needs precise time management. Each tool offers an intuitive UI and various customization options designed for real-world use.

All features are free without registration or app installation. Tool settings and records are mainly stored in this browser. PWA support lets you install it on mobile devices and use it like an app.

Time Management Guides

A collection of practical guides for productivity and effective time use.

Exam Time Management StrategiesTime allocation strategies for major exams including SAT, civil service tests, and TOEIC. Learn mock exam timer techniques and test-day time management tips.The Complete HIIT Workout Timer GuideUnderstand the limits of HIIT research and the timer's Tabata, HIIT, and custom settings, including sound and screen wake-lock limits.Sports Training with a StopwatchA practical guide to marking track, swim, and court practice splits by hand. Learn how lap and cumulative times, CSV export, and browser timing limits differ from official measurement.Creative Ways to Use a D-Day CountdownCreative ways to use D-Day countdowns for exam prep, anniversaries, project deadlines, travel departures, and goal tracking. Manage up to 20 events simultaneously with Clock-Tani's free D-Day counter.How to Use a Tabata Workout TimerLearn what the original Tabata study tested and how to use the 20s-work, 10s-rest preset. The timer does not assess exercise intensity or safety.How to Calculate Time Zone DifferencesEverything about time zones: UTC and GMT basics, daylight saving time (DST) rules, international meeting scheduling tips, and major city time differences. Essential for global business and travel planning.

View All Guides →

Frequently Asked Questions

Is Clock-Tani free?

Yes, all features are completely free. No registration is required.

Can I use it on mobile?

Yes, the responsive design provides an optimized experience on mobile, tablet, and desktop. You can also install it as a PWA to use it like an app.

Is my data safe?

Tool data such as alarm settings and timer records is mainly stored in your browser. If you create a share link, selected settings may appear in its address and be transmitted when opened. See the Privacy Policy for site access records, analytics and advertising processing based on your choices, and feedback submissions.

Can I use it without an internet connection?

Offline availability depends on what has been cached. The service worker precaches the Korean clock page; other same-origin pages and static assets can reopen if they were successfully visited online and remain cached. A first-time page load, server-time request, or external resource still needs a network connection.

Which browsers are supported?

Works on all modern browsers including Chrome, Safari, Firefox, and Edge. We recommend using the latest version for the best experience.

Sound is not playing. What should I do?

Check your browser's sound settings and device volume. On mobile, make sure silent mode is turned off for alarm sounds to play.

How can I suggest features or report bugs?

Please send an email to admin@teck-tani.com and we'll review your feedback.