World Time Zone Map

Every zone on this map is shaded by its local hour-of-day, computed from your own device clock using the browser’s built-in IANA time zone database. It repaints every 30 seconds and each of the 65 city markers ticks live. Use the pin-a-time control to see the whole world at a specific hour in India.

New York · EST/EDT2:08 PMUTC−5

Your time11:38 PMSAT, OCT 31UTC+5:30

Paris timeParis7:08 PMSAT, OCT 31UTC+1

Eastern timeEastern2:08 PMSAT, OCT 31UTC-4

Kolkata timeKolkata11:38 PMSAT, OCT 31UTC+5:30

Tokyo timeTokyo3:08 AMSUN, NOV 1UTC+9

Map loading…

Show city clocks

Show this region at a specific hour (IST):

Zones in this view

Zone	IANA	Standard	Daylight	Abbr
New York	America/New_York	UTC−5	UTC−4 (EDT)	EST/EDT
London	Europe/London	UTC0	UTC+1 (BST)	GMT/BST
Kolkata	Asia/Kolkata	UTC+5:30	—	IST
Tokyo	Asia/Tokyo	UTC+9	—	JST
Sydney	Australia/Sydney	UTC+10	UTC+11 (AEDT)	AEST/AEDT
Auckland	Pacific/Auckland	UTC+12	UTC+13 (NZDT)	NZST/NZDT

Good to know

For a focused view, use the North America, Europe, Asia, Australia, or South America region maps.

Where the offsets come from

Every offset on this map is counted from Greenwich. Five dates in how the world agreed on that.

Before 1883

Sun time

Every town set its clocks by the sun overhead, so noon in Boston came about twelve minutes before noon in New York, and railroads juggled dozens of local times.

A weathered stone sundial with Roman numerals and an iron gnomon — A sundial on the porch of St Giles’ Church, Chesterton, England.

November 18, 1883

Railroad time

U.S. and Canadian railroads switched to standard zones an hour apart, set from Greenwich. Many towns reset their clocks the same day, remembered as “the day of two noons.”

A gold railroad pocket watch with a white dial, lying on its chain — A railroad pocket watch made for the Plant System, a railroad of the Southeast.

1884

Greenwich

Delegates at the International Meridian Conference in Washington chose the Greenwich meridian as longitude zero — the line every UTC offset on this site is counted from.

A red time ball on its mast above the octagonal turret of the Royal Observatory — The time ball on the Royal Observatory, Greenwich, dropped at 1 p.m. as a public time signal since 1833.

1918 and 1966

Time by law

The Standard Time Act made the zones federal law in 1918. The Uniform Time Act of 1966 set common daylight-saving rules and let a state opt out, as Arizona and Hawaii do.

The open back of a railroad-grade pocket watch, showing its jewelled movement — The movement of a Hamilton railroad-grade pocket watch, about 1929.

2026

Daylight saving

Since 2007 clocks spring forward on the second Sunday of March and fall back on the first Sunday of November: March 8 and November 1 this year.

A large 24-hour clock face set into a red brick wall beneath a sign reading Royal Observatory Greenwich — The Shepherd Gate Clock at Greenwich, which shows Greenwich Mean Time on a 24-hour dial.

Frequently asked questions

Where does this map get its times from?

Your device’s built-in time zone database (ICU/Intl). No server time is used, so the map can’t be out of sync with your real clock.

How many time zones are on the map?

The geometry includes 65 major zones and 65 city markers, simplified for fast loading (Timezone Boundary Builder 2026e).

What does the shading mean?

Color band = local hour-of-day: dark night, dawn, midday, dusk, late night. It’s the day/night terminator, not temperature.

Sources: offsets and daylight saving rules from theIANA time zone database; zone shapes from Timezone Boundary Builder. See Data Sources for versions and limitations.