Datetime.app

World Clock & TimeCurrent Time Around the World, UTC Time Converter, Timezone Calculator

Your Local TimeUTCGMT+0

03:46:14
Friday
October 23, 2026
Clock is synchronized (±0ms)

DateTime for Developers

Timezone Information
UTC (GMT+0)
Unix Timestamp
1792727174
UTC Time
Fri, 23 Oct 2026 03:46:14 GMT
ISO Format
2026-10-23T03:46:14.875Z

World Clock

UTCLocal
GMT+0 · Today
03:46
Daytime08:00–18:00Early / late06:00–08:00 · 18:00–22:00Night22:00–06:00Now

Time Zone Converter

Converted Time

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Time Tools

01Year Progress Bar
02Age Calculator
03UTC Time
04World Holidays
05Timezones

World City Times

New York
US · GMT-4
23:46
London
GB · GMT+1
04:46
Tokyo
JP · GMT+9
12:46
Paris
FR · GMT+2
05:46
Sydney
AU · GMT+11
14:46
Beijing
CN · GMT+8
11:46

Global Major Cities

Upcoming holidays

Live countdowns to the next holidays, in your time zone.

All countdowns →

The time, exactly right

datetime.app is a free world clock that shows the current time in your location and in cities around the world. The clock runs to the second, is corrected against a trusted time source, and follows the IANA time zone database, so every offset and daylight saving rule is current.

Use it to compare time zones side by side, convert between cities, check UTC, or copy a ready-made timestamp. No sign-up and nothing to install.

Time zone basics

The six terms you meet most often when working across time zones.

  • UTC

    Coordinated Universal Time

    The global reference every time zone is defined against. It has no daylight saving and never changes.

  • GMT

    Greenwich Mean Time

    The UTC+0 zone used in the UK in winter. For everyday purposes it matches UTC.

  • IANA

    Time zone database

    Names like America/New_York or Asia/Tokyo identify a region's full history of offsets and DST rules.

  • DST

    Daylight saving time

    Clocks move forward in spring and back in autumn in many countries, so offsets change twice a year.

  • ISO 8601

    Date & time format

    2026-03-08T14:30:00Z is unambiguous, sortable and understood by every programming language.

  • Unix time

    Seconds since 1970

    A single integer that represents an exact moment, independent of any time zone.

Browse the full glossary

Popular time zones

Current time and offset for the zones people look up most.

PST / PDT
Pacific · UTC−8 / −7
EST / EDT
Eastern · UTC−5 / −4
CST / CDT
Central · UTC−6 / −5
GMT
Greenwich · UTC+0
CET / CEST
Central Europe · UTC+1 / +2
IST
India · UTC+5:30
JST
Japan · UTC+9
AEST / AEDT
Eastern Australia · UTC+10 / +11
All IANA time zonesUTC now

Daylight saving time 2026

When clocks change this year in the main regions.

RegionClocks forwardClocks backRule
United States & CanadaMar 8Nov 12nd Sunday of March to 1st Sunday of November
European Union & UKMar 29Oct 25Last Sunday of March to last Sunday of October
Australia (NSW, VIC)Oct 4Apr 51st Sunday of October to 1st Sunday of April

Southern hemisphere dates run across the new year. Many regions, including most of Asia and Africa, do not observe daylight saving.

Who uses datetime.app

Remote teams

Put every teammate's city on one timeline and see which hours overlap before you schedule the call.

Developers

Copy the current Unix timestamp, ISO 8601 and RFC 2822 strings, or an Intl snippet for the zone you are viewing.

Travellers

Check the local time at your destination, the offset from home, and whether it is a good moment to phone someone.

Traders and gamers

Know when a market opens or a server resets, in your own time and in UTC.

Frequently Asked Questions

What is UTC/GMT time?

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks and time. It is similar to GMT (Greenwich Mean Time) but is more precisely defined by atomic clocks. UTC is the time standard used across the internet and for international communications and aviation.

How do timezones work?

Timezones are regions of the globe that observe a uniform standard time. They are generally defined as offsets from UTC, typically in whole-hour increments. For example, Eastern Standard Time (EST) is UTC-5, meaning it is 5 hours behind UTC. Timezones were created to standardize time across large geographical areas and are often influenced by political boundaries as well as geographical ones.

What is a Unix timestamp?

A Unix timestamp (also known as Unix time or POSIX time) represents the number of seconds that have elapsed since January 1, 1970, at 00:00:00 UTC, not counting leap seconds. It's widely used in computer systems and programming as a standardized way to track time regardless of timezone. Unix timestamps make it easy to calculate time differences and are independent of calendar conventions.

How accurate is this clock?

The accuracy of this clock depends on your device's system clock and internet connection. While we strive to display the most accurate time possible, there may be slight variations due to network latency or your device's clock synchronization. For most everyday purposes, the time displayed should be accurate within a few seconds of the actual time. For applications requiring millisecond precision, specialized time servers should be used.

What is ISO 8601 format?

ISO 8601 is an international standard for representing dates and times. It follows the format YYYY-MM-DDTHH:MM:SS.sssZ, where: YYYY-MM-DD represents the date (year, month, day), T is a separator between date and time, HH:MM:SS.sss represents the time (hours, minutes, seconds, and milliseconds), Z indicates that the time is in UTC (or an offset can be specified, like +01:00). This format eliminates ambiguity in international communications and is widely used in computing.

What is Daylight Saving Time?

Daylight Saving Time (DST) is the practice of advancing clocks during warmer months so that darkness falls later each day according to the clock. Typically, regions that observe DST adjust clocks forward one hour in the spring ("spring forward") and adjust them backward in the autumn ("fall back"). The main purpose is to make better use of daylight during the evening hours. Not all countries observe DST, and the start and end dates vary by region.

How do I convert between timezones?

To convert time between timezones, you need to: 1) Determine the UTC offset for both the source and target timezones, 2) Convert the source time to UTC by adding or subtracting its offset, 3) Convert from UTC to the target timezone by adding or subtracting the target timezone's offset. For example, to convert 3:00 PM in New York (UTC-5) to London time (UTC+0), you would add 5 hours to get 8:00 PM London time. Remember to account for Daylight Saving Time if applicable, as it can change the UTC offset temporarily.

How does datetime.app show the exact time?

It reads your device clock and corrects it against a trusted time source, then updates every second. Time zone offsets come from the IANA database, so daylight saving changes are applied automatically.

What is the difference between UTC and a local time zone?

UTC is the fixed global standard. A local time zone is UTC plus an offset, such as UTC+9 for Tokyo, and may shift by an hour when daylight saving begins or ends.

How do I find the best time for a meeting across time zones?

Add each city to the world clock timeline. The shaded bars show daytime, early and late hours, and night, so you can pick a slot that falls inside everyone's working day.

Does the site work for any city?

Yes. Use the Add Timezone menu on the home page, or open one of the city and time zone pages linked below.