📖 How to Use TimeWeMeet
Meeting Planner — Schedule across time zones:
Other features:
🗓 Meeting Planner
Set time in any city — all others update with local date, weekday & time.
⏳ Time Until Meeting
🌍 Understanding Time Zones: A Complete Guide
The world is divided into 24 primary time zones, each roughly 15 degrees of longitude wide. However, political boundaries, historical decisions, and practical considerations mean that the actual map of time zones is far more complex. Countries like India use a single time zone (UTC+5:30) despite spanning a wide area, while Russia stretches across 11 time zones and China uses only one (UTC+8) for its entire territory.
The International Date Line runs through the Pacific Ocean, roughly following the 180° meridian. When you cross it heading west, you skip forward one day; heading east, you repeat a day. This is why scheduling meetings between Asia-Pacific and the Americas requires extra care — participants may actually be on different calendar dates.
What is UTC?
Coordinated Universal Time (UTC) is the global time standard that all time zones are defined relative to. Unlike GMT (Greenwich Mean Time), UTC is precisely maintained using atomic clocks and does not observe daylight saving time. When TimeWeMeet calculates meeting times, it first converts your chosen time to UTC, then converts from UTC to each participant's local time — ensuring perfect accuracy regardless of DST transitions.
Daylight Saving Time Challenges
Daylight Saving Time (DST) is one of the biggest sources of scheduling confusion in international business. Not all countries observe DST, and those that do switch on different dates. For example, the United States springs forward on the second Sunday of March, while the European Union changes on the last Sunday of March — creating a 2-3 week period where the usual time difference shifts by one hour. Southern hemisphere countries like Australia and Brazil observe DST during the northern hemisphere's winter, effectively reversing the pattern.
TimeWeMeet handles all of this automatically using the IANA Time Zone Database, the same database used by operating systems and smartphones worldwide. Every conversion accounts for the current DST status of each location, so you never have to worry about whether a city has "sprung forward" or "fallen back."
💼 Tips for Scheduling International Meetings
Finding the "Golden Window"
When participants span multiple continents, finding a time that works for everyone is a real challenge. The key is identifying the overlap window — the hours when all participants are awake and ideally within business hours. For the most common international corridors, here are typical overlap windows:
Best Practices for Global Teams
Rotate meeting times fairly. If you always schedule at a time convenient for headquarters, remote team members in other time zones bear the full burden. Rotating the meeting time ensures everyone takes turns with early or late calls.
Always include the timezone in invitations. Stating "3 PM" without a timezone is the number one cause of missed meetings in international teams. TimeWeMeet solves this by showing the exact local time for each participant and generating a universal .ics file that automatically displays in each recipient's local timezone.
Mind the Monday/Friday trap. Monday morning in New York is still Sunday evening in Honolulu. Friday afternoon in London is already Saturday morning in Tokyo. When scheduling at the edges of the work week, always check the date — not just the time — for all participants.
Build in buffer time. When crossing many time zones, people are more likely to forget or confuse the time. Send calendar invites well in advance and include a brief reminder 30 minutes before the meeting. The .ics export from TimeWeMeet includes a built-in 15-minute reminder alarm.
❓ Frequently Asked Questions
How do I plan a meeting across time zones?
Enter your city in the first row, set your preferred meeting time and date, then add participant cities using the "+ Add location" button. TimeWeMeet instantly calculates the correct local date, weekday, and time for every location. You can edit the time from any row and all others update automatically — so if a participant says "3 PM works for me," just change their row and see what that means for everyone else.
Can I download a calendar invite?
Yes. Click the "Apple / Google" or "Outlook" button in the Meeting Planner section to download a universal .ics calendar file. The file uses UTC timestamps, which means it automatically displays in each recipient's correct local time when imported into Apple Calendar, Google Calendar, or Microsoft Outlook. The invite includes all participant cities and a 15-minute reminder.
How many cities does TimeWeMeet support?
TimeWeMeet includes over 200 cities across every continent and every major time zone variant. This includes multiple cities for large countries — for example, the United States has 6 zones (Eastern, Central, Mountain, Pacific, Alaska, Hawaii), Russia has 8 zones, Canada has 7 (including the unusual UTC-3:30 Newfoundland zone), and Australia has 6. The database covers all sovereign nations and major economic centers worldwide.
Does TimeWeMeet handle Daylight Saving Time?
Yes, automatically. TimeWeMeet uses the IANA Time Zone Database (the same one used by your operating system and smartphone), which tracks all current and historical DST transitions worldwide. When you schedule a meeting, the displayed times account for whether each city is currently observing DST or standard time — even when cities in different countries switch on different dates.
Is TimeWeMeet free?
Yes, TimeWeMeet is completely free with no registration required. All features — the meeting planner, world clock, timers, calendar, calculators, and converters — are available without creating an account. The site is supported by advertisements.
How accurate are the time conversions?
TimeWeMeet's conversions are as accurate as your browser's built-in timezone engine, which uses the internationally maintained IANA Time Zone Database. This database is updated several times per year to reflect changes in timezone rules made by governments. All conversions use a single UTC reference point to prevent rounding errors or drift.
🗺 World Time Zone Overview
The world's time zones range from UTC-12 (Baker Island) to UTC+14 (Line Islands, Kiribati), meaning there are always two calendar dates in effect somewhere on Earth. Here is a summary of major timezone groups and the key cities in each:
Note that UTC offsets shown above are for standard time. During Daylight Saving Time periods, many of these cities shift by +1 hour. TimeWeMeet automatically handles these transitions for you.
📖 About TimeWeMeet
TimeWeMeet was created to solve a simple but persistent problem: scheduling meetings across time zones shouldn't require mental math. Whether you're coordinating a call between New York and Tokyo, planning a webinar for a global audience, or simply trying to figure out when your colleague in Sydney is awake, TimeWeMeet gives you the answer instantly.
Unlike other timezone tools, TimeWeMeet is designed with a meeting-first approach. Instead of showing you a list of clocks and leaving you to figure out the overlap, it lets you pick a time in any city and immediately see what that time means for every other participant — complete with the local date, weekday, and a color-coded indicator showing whether it falls within business hours, evening, or nighttime.
The universal .ics calendar export ensures your meeting shows up correctly in every participant's calendar, regardless of their platform or timezone settings. The file is generated in UTC and automatically converts to local time in Apple Calendar, Google Calendar, and Microsoft Outlook.
TimeWeMeet is free, requires no registration, and works entirely in your browser with no data sent to any server. Your meeting details stay on your device.
🕐 About the World Clock
TimeWeMeet's world clock displays live, second-by-second time for over 200 cities worldwide. Each clock shows the current local time, date, day of week, and UTC offset — all updated in real time without refreshing the page.
How to Use
The world clock starts with 12 popular cities spanning all major time zones. To add more cities, use the search bar above — type a city name or country and select from the dropdown. The search covers every major timezone variant, including unusual offsets like Nepal (UTC+5:45), Iran (UTC+3:30), and Newfoundland, Canada (UTC-3:30).
Why Do We Have Time Zones?
Before the late 19th century, every town set its own local time based on the position of the sun. This worked fine when travel was slow, but the expansion of railways made it chaotic — a train traveling from east to west would pass through dozens of slightly different local times. In 1884, the International Meridian Conference in Washington, D.C. established the system of 24 standard time zones based on the prime meridian at Greenwich, England. Today, this system has evolved to include half-hour and quarter-hour offsets to accommodate political and geographical boundaries.
Interesting Time Zone Facts
China's single time zone: Despite spanning five geographical time zones, China uses only Beijing Time (UTC+8) across its entire territory. This means that in western Xinjiang, the sun doesn't rise until 10 AM in winter.
India's half-hour offset: India Standard Time (UTC+5:30) is one of several half-hour offset zones. This was a deliberate compromise — a single zone for the entire country, set between the natural times of its eastern and western borders.
The International Date Line: It's not a straight line at all. It zigzags through the Pacific to keep island nations on the same day as their trading partners. Kiribati even pushed the line east in 1995, creating the world's first UTC+14 zone so the entire country could share the same calendar date.
⏱ Stopwatch
⏲ Countdown
🎯 Event Countdown
⏱ About Timers & Countdowns
TimeWeMeet offers three timer tools, each designed for different use cases — from tracking sprint intervals to counting down to important life events.
Stopwatch
A precision stopwatch with 10-millisecond resolution, lap recording, and cumulative timing. Use it for timing presentations (most TED talks aim for 18 minutes or less), tracking exercise intervals, or measuring task completion times. Each lap records both the individual split time and the running total, making it easy to compare intervals.
Countdown Timer
Set any duration in hours, minutes, and seconds. The countdown timer is ideal for Pomodoro technique sessions (typically 25 minutes of focused work followed by a 5-minute break), cooking timers, meeting time limits, or exam practice. The timer continues running even if you switch to another section of TimeWeMeet.
Event Countdown
Enter any future date and time to see a live countdown in days, hours, minutes, and seconds. Popular uses include counting down to product launches, holidays, birthdays, retirement dates, or project deadlines. The countdown updates every second, giving you a visceral sense of how quickly time is passing.
The Science of Time Perception
Psychologists have found that time perception varies dramatically with context. When we're engaged in challenging, enjoyable work (a state called "flow"), hours can feel like minutes. Conversely, waiting with nothing to do makes time crawl. This is called the oddball effect — novel or unexpected stimuli are perceived as lasting longer than familiar ones. Countdown timers tap into this psychology by making abstract deadlines feel concrete and immediate.
☀️ Sun
~50°N
🌙 Moon
📅 About the Calendar & Celestial Data
TimeWeMeet's calendar provides a clean monthly view with sun and moon information calculated for your approximate latitude. It's designed for quick date reference, week planning, and awareness of natural light cycles.
Understanding the Sun Data
The sunrise and sunset times shown are approximate values calculated for ~50°N latitude (roughly the latitude of Frankfurt, Prague, and Vancouver). The daylight duration varies dramatically through the year at this latitude — from about 8 hours in December to over 16 hours in June. The sun position bar gives you an at-a-glance view of where you are in the current day's light cycle.
At the equator, days are almost exactly 12 hours year-round. At the Arctic Circle (66.5°N), the sun doesn't set at all during midsummer — the famous "midnight sun." These extreme variations are why northern countries like Finland and Norway have such distinct cultural relationships with light and darkness.
Moon Phases Explained
The moon completes a full cycle every 29.53 days (a synodic month). The eight major phases are: New Moon → Waxing Crescent → First Quarter → Waxing Gibbous → Full Moon → Waning Gibbous → Last Quarter → Waning Crescent. TimeWeMeet calculates the current phase and illumination percentage using a mathematical model based on known new moon reference dates.
Moon phases have practical significance beyond astronomy. Gardeners have planted by moon phases for centuries (though scientific evidence is mixed). Ocean tides are strongest during new and full moons (spring tides) and weakest during quarter moons (neap tides). Many cultural and religious calendars — including the Islamic, Jewish, and Chinese calendars — are based partly or entirely on lunar cycles.
The Gregorian Calendar
The calendar you see here uses the Gregorian calendar, introduced by Pope Gregory XIII in 1582 to correct a drift in the older Julian calendar. The Julian calendar assumed a year of exactly 365.25 days, but the actual tropical year is about 11 minutes shorter. Over centuries, this caused the calendar to drift relative to the seasons. The Gregorian reform removed 10 days and introduced the rule that century years are only leap years if divisible by 400 — which is why 2000 was a leap year but 1900 was not.
📏 Date Difference
➕ Add/Subtract
🎂 Age
📅 Weekday
📏 About Date Calculators
TimeWeMeet provides four essential date calculation tools that save you from error-prone mental arithmetic with calendars.
Date Difference Calculator
Calculate the exact number of days between any two dates, with automatic conversion to weeks, months, and years. Common uses include calculating the length of a contract, counting days until a deadline, or figuring out how long ago a historical event occurred. The calculator accounts for varying month lengths and leap years.
Add/Subtract Days
Start from any date and add or subtract a number of days to find the resulting date. This is essential for calculating due dates (e.g., "30 days after invoice date"), warranty expiration ("365 days from purchase"), or project milestones. The tool correctly handles month boundaries and leap years — adding 30 days from January 15 gives you February 14, not "January 45."
Age Calculator
Enter a date of birth to see the exact age in years, months, and days, plus the total number of days lived. The calculator handles the subtleties of age calculation — for example, someone born on February 29 in a leap year correctly shows their age relative to February 28 in non-leap years.
Weekday Finder
Discover what day of the week any date falls on, along with the ISO week number. This is useful for historical research (what day was D-Day?), event planning (does my birthday fall on a weekend this year?), or business calculations that depend on working days. The ISO week number follows the international standard where Week 1 is the week containing the first Thursday of the year.
Why Date Math is Tricky
Date calculations seem simple, but they hide surprising complexity. Months have different lengths (28–31 days). Leap years add an extra day every four years — except century years, unless divisible by 400. Time zones can shift the date depending on when you measure. And if you go back far enough, you encounter the 1582 Julian-to-Gregorian transition, where 10 days were simply skipped. TimeWeMeet handles all modern date calculations correctly using the standard Gregorian calendar.
🔢 Epoch
🌐 Timezone
⏳ Time Units
🔢 About Time Converters
TimeWeMeet includes three conversion tools commonly needed by developers, analysts, and anyone working with time data across systems.
Unix Epoch Converter
The Unix epoch (also called Unix time or POSIX time) counts the number of seconds since January 1, 1970 at 00:00:00 UTC. It's the standard way computers represent time internally — every timestamp in a database, log file, or API response is likely stored as a Unix timestamp. TimeWeMeet shows the current epoch in real time and lets you convert in both directions: timestamp to human-readable date, and date to timestamp.
Unix time has a known limitation called the Year 2038 problem. Systems that store the epoch as a 32-bit signed integer will overflow on January 19, 2038 at 03:14:07 UTC, wrapping around to a date in December 1901. Most modern systems now use 64-bit integers, which extends the range to approximately 292 billion years — well beyond the expected lifetime of our solar system.
Timezone Converter
Convert any time from one timezone to another. This is particularly useful when you receive a timestamp in one timezone and need to know the equivalent in yours. The converter uses the full IANA timezone database, so it correctly handles DST transitions and unusual offsets like UTC+5:45 (Nepal) or UTC+9:30 (Central Australia).
A common source of confusion is that timezone abbreviations like "CST" are ambiguous — it could mean Central Standard Time (UTC-6, USA), China Standard Time (UTC+8), or Cuba Standard Time (UTC-5). TimeWeMeet avoids this by using city-based identification, which always maps to a single, unambiguous timezone rule.
Time Unit Converter
Quickly convert between milliseconds, seconds, minutes, hours, days, and weeks. This is useful for developers (converting API timeout values), project managers (how many hours in a 90-day sprint?), and anyone doing quick time math. Some useful reference conversions: 1 day = 86,400 seconds = 1,440 minutes. 1 week = 604,800 seconds. 1 million seconds ≈ 11.57 days.
A Brief History of Timekeeping
Humans have measured time for thousands of years — from sundials in ancient Egypt to water clocks in China, mechanical clocks in medieval Europe, and the quartz revolution of the 20th century. Today's most accurate timekeepers are optical lattice clocks, which use lasers to trap atoms of strontium or ytterbium. These clocks are so precise they would neither gain nor lose a second over the entire 13.8-billion-year age of the universe. The international second is officially defined as 9,192,631,770 cycles of the cesium-133 atom's radiation.