Exact Time Online — Free World Clock, Alarm, Timer, Stopwatch & Time Zones
Time Zones
Online Alarm Clock
The alarm rings natively inside your web browser. Please keep this active browser tab open to ensure notification delivery.
Free Online Alarm Clock
Set a precise alarm directly in your browser — no installation required. Enter your time, add an optional label (e.g. Team Standup), and select your preferred alert sound from 20 options.
The alarm fires natively inside your browser tab using Web Audio API. Simply keep the tab open and your device volume on — no special permissions or notifications required.
Pomodoro Countdown Timer
Free Online Pomodoro Timer
Boost your productivity with the Pomodoro technique — alternate between 25-minute focus sessions, Short Breaks (5 min) and Long Breaks (15 min) to maintain peak performance throughout the day.
Choose from 20 bell sounds, set any duration in Custom mode, and keep your sessions on track — all directly in your browser with no installation needed.
Stopwatch
Online Stopwatch with Lap Timing
Measure time intervals with centisecond precision — ideal for sports, cooking, science experiments, or any activity requiring accurate interval control. The display runs at up to 60 fps for a smooth real-time readout.
Press Lap to record split times: each lap stores the partial and cumulative totals. Your lap history is shown below and cleared automatically when you reset.
Quick Tasks & Reminders
Create Countdown
Countdown Timer for Any Event
Create real-time countdowns to any future date — birthdays, trips, product launches, sports events, or major holidays. The flip clock updates every second showing days, hours, minutes and seconds remaining.
Use quick-select presets for New Year, Christmas, Halloween, or Summer Solstice, or enter a custom date and event name. Each countdown runs live until you go back to the setup form.
Date Calculator
Difference Between Two Dates
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Add / Subtract from a Date
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Age Calculator
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Time Calculator
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Add / Subtract Time
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About the Date Calculator
Use this free online date calculator to find the exact number of days, weeks, months, and years between any two dates — or to add and subtract any amount of time from a starting date.
Perfect for planning deadlines, anniversaries, countdowns, contract durations, and more. No sign-up or installation required.
Upcoming Events
Free Minimalist World Clock, Alarm & Focus Timer
Welcome to TrueTime.zone, your comprehensive web station for atomic time accuracy and remote workflow tools. Our online software cross-references network data to serve a dark-mode fullscreen flip clock, synchronizing precise local time zones globally.
Optimize your daily schedule directly via your browser with our integrated online alarm clock, customizable high-productivity pomodoro timer, and frictionless task management logs. No software installs or premium registration required.
How TrueTime Keeps Accurate Time
Every clock on this page is driven by your device's system time, which most computers and phones keep in sync with global time servers using the Network Time Protocol (NTP). Those servers ultimately trace back to atomic clocks — instruments so precise they lose less than a second over millions of years. When you open TrueTime, the clock reads your local time and ticks forward in real time in your browser, with nothing to install and nothing to configure. As long as your device clock is set correctly, the time you see here is accurate to the second.
What Is a World Clock and Why Use One?
A world clock shows the current time in several places at once. It's indispensable if you work with a remote team, have family abroad, follow international markets, or simply want to know whether it's a reasonable hour to call someone on the other side of the planet. TrueTime's world clock lists major cities side by side and marks whether each one is in daytime or night, so a single glance tells you who's awake. The interactive globe spins through the world's regions and highlights live local times as it turns.
Understanding UTC and Time Zones
Coordinated Universal Time (UTC) is the global reference from which every time zone is measured. Your local time is simply UTC plus or minus a fixed offset — New York runs at UTC−5 in winter, while Tokyo sits at UTC+9 all year. Because the Earth rotates 15 degrees of longitude every hour, the planet is split into 24 primary zones, though political borders and half-hour offsets (like India's UTC+5:30) make the real map more interesting than a tidy grid. Knowing your offset from UTC is the key to converting any time, anywhere — and our free time zone converter does the math for you.
Reading 24-Hour Time and the Flip Clock
The classic flip-clock display above can show time in either 12-hour (AM/PM) or 24-hour format. The 24-hour system — where 1:00 PM becomes 13:00 and midnight is 00:00 — is the international standard for aviation, medicine, the military, and most of the world outside North America. It removes the ambiguity of AM and PM, which is exactly why it's preferred whenever a mistake would be costly. Use the format toggle to switch between the two whenever you like.
Every Time Tool in One Place
TrueTime.zone bundles the time utilities people search for most into one fast, ad-light, install-free site:
- Timer — a Pomodoro-style countdown timer for focused work sessions.
- Stopwatch — precise timing with lap splits.
- Alarm Clock — set an in-browser alarm that rings even if you forget the tab.
- Countdown — count down to any date, holiday, or deadline.
- Date Calculator — find the gap between dates, add or subtract days, and calculate ages.
- Time Zone Converter — convert any time between 100+ world zones instantly.
Everything runs in your browser, works on desktop and mobile, and is completely free. Want to go deeper? Our blog explains how time actually works — from UTC to daylight saving time.
Frequently Asked Questions
Is the time on this page accurate?
Yes. It reflects your device's clock, which is normally synced to atomic-clock-backed time servers. If it looks off, open your system's date-and-time settings and make sure "set time automatically" is enabled.
Do I need to install anything?
No. TrueTime runs entirely in your web browser. There's nothing to download, no account to create, and no premium tier.
Do the alarm and timer work if I switch tabs?
Yes. Timers and alarms keep running in the background and will sound when the time is up, as long as the tab stays open.
Can I use TrueTime offline?
The first load needs an internet connection. After that, the clock keeps ticking from your device's own time even if your connection drops.
Is it really free?
Completely. TrueTime is built and maintained by one person and kept free for everyone — if it's useful to you, you can support it with a small tip via the ☕ button.