US Time Zone Map

Asia Time Zone Map

Asia holds the continent’s oddities: China locked to a single UTC+8 despite five geographic zones, two famous sub-hour offsets (India +5:30, Nepal +5:45), and a huge no-DST east.

Dubai · GST10:08 PMUTC+4
Your time11:38 PMSAT, OCT 31UTC+5:30
Karachi timeKarachi11:08 PMSAT, OCT 31UTC+5
Tehran timeTehran9:38 PMSAT, OCT 31UTC+3:30
Kolkata timeKolkata11:38 PMSAT, OCT 31UTC+5:30
Kathmandu timeKathmandu11:53 PMSAT, OCT 31UTC+5:45
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Zones in this view

ZoneIANAStandardDaylightAbbr
DubaiAsia/DubaiUTC+4—GST
TehranAsia/TehranUTC+3:30— (no DST since 2022)IRST
KarachiAsia/KarachiUTC+5—PKT
KolkataAsia/KolkataUTC+5:30—IST
KathmanduAsia/KathmanduUTC+5:45—NPT
DhakaAsia/DhakaUTC+6—BST
TokyoAsia/TokyoUTC+9—JST

Good to know

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

What time zone is China in?

All of mainland China uses Beijing Time (UTC+8), a 1949 unification — even though the country spans five geographic zones.

Why is India’s offset +5:30?

India’s longitude sits between UTC+5 and UTC+6, so it adopted UTC+5:30 as a single national compromise. Iran (+3:30), Afghanistan (+4:30), Nepal (+5:45), and Myanmar (+6:30) also use non-whole-hour offsets.

Does Japan observe daylight saving?

No — Japan (and China, Korea, and most of Asia) keep a fixed offset year-round.

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