World Clock
Fast, accurate and free online world clock tool running directly in your browser.
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Other tools you may find usefulWorld clock – current time in any time zone
The world is divided into 38 time zones (from UTC-12 to UTC+14). Planning international meetings, online conferences or calls with family abroad requires a quick comparison of zones. The tool displays the current time in selected cities and takes into account the summer shift (DST).
Time zones - basics
UTC (Universal Time Coordinated): base standard, formerly GMT. Zones: UTC-12 (Baker Island) to UTC+14 (Kiribati). Poland: CET (UTC+1) in winter, CEST (UTC+2) in summer. DST (Daylight Saving Time): clocks forward in March, backward in October in the EU. USA: different DST dates than Europe (coordination difficult for 2-3 weeks).
Major business centers and their zones
UTC+0: London (GMT/BST). UTC+1: Warsaw, Berlin, Paris (CET). UTC+2: Athens, Kyiv, Cairo. UTC+3: Moscow, Istanbul, Riyadh. UTC+5.5: Mumbai, Delhi (IST). UTC+8: Beijing, Singapore, Hong Kong. UTC+9: Tokyo, Seoul. UTC-5: New York (EST). UTC-6: Chicago. UTC-8: San Francisco (PST). UTC-3: Sao Paulo.
International meeting scheduling
Overlap finder: find overlapping work hours. London (UTC+0) + Warsaw (UTC+1) + New York (UTC-5): 15:00 Warsaw = 14:00 London = 9:00 NY – good time. Tools: worldtimebuddy.com, when2meet.com. Google Calendar: Shows the participant's time zone in the invitation. Zoom: automatically converts the invitation time.
Interesting facts about time zones
Kiribati (UTC+14): the first countries to welcome the New Year (Line Islands). Nepal: UTC+5:45 (15-minute offset). India: UTC+5:30. China: one time for the entire country (UTC+8), although geographically there are 5 zones. Australia: 3 zones + NT (UTC+9:30). France: 12 zones (overseas territories). USA: 6 zones (Alaska, Hawaii, 4 continental).
Frequently asked questions
How to check the current time in another country?
Google: type "time in [city]". Siri/Alexa: "What time is it in Tokyo?" worldclock.com. timeanddate.com. Mobile application: "World Clock" (built-in in iOS). Android: add a city in the clock (Clock app → World Clock). Slack: Shows the user's local time in the profile.
How to plan work with people in different time zones?
Asynchronous tools: Loom (recording), Notion (documentation), Slack (do not require immediate response). Overlap time: 1-2 hours per day for synchronous meetings. Clear deadlines: specify a deadline with a time zone ("Friday 17:00 CET"). Meeting rotation: It's not always the same person who has an uncomfortable time.
What is Unix timestamp and how to use it?
Unix timestamp: number of seconds since January 1, 1970 00:00:00 UTC (The Epoch). Current value: approximately 1.7 billion seconds. Advantages: zone-neutral, easy to calculate (difference = seconds). JavaScript: Date.now() / 1000 or Math.floor(Date.now()/1000). Python: import time; time.time(). Conversion: epochconverter.com.
Problem of 2038 (Y2K38)?
Unix timestamp in 32-bit signed int: maximum = 2147483647 = Jan 19, 2038, 03:14:07 UTC. After this date: overflow to a negative number = systems errors. Linux kernel, iOS, Android: already use 64-bit timestamps (problem solved). Old embedded systems: a potential problem. It is less dangerous than Y2K because the world has 15 years to repair it.
How does DST affect programming?
Traps: 2 AM → 3 AM (spring forward) = 1h does not exist. 3 AM → 2 AM (fall back) = 1h exists 2 times. Solution: store UTC, convert locally when displaying. Libraries: moment.js (legacy), date-fns, Day.js, Temporal API (proposed). Never store local time in a DB without a zone.
Related tools: time difference calculator, Unix timestamp converter and date calculator.