🌍 Convert Time Between Zones

Date & Time to Convert

From Time Zone

To Time Zone

FROM

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⚡ Quick Conversions — Common Routes

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Find the best time for a global meeting. Enter a time in one zone to see it in all others.

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💡 Time Zone Facts & Trivia

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Total Time Zones

There are 38 unique UTC offsets in the world, ranging from UTC-12 (Baker Island) to UTC+14 (Line Islands, Kiribati). Not all offsets are whole hours — some like India (UTC+5:30) and Nepal (UTC+5:45) use 30 or 45 minute offsets.

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Same Moment, Different Days

The world's largest time difference is 26 hours — between Baker Island (UTC-12) and Line Islands (UTC+14). This means two places on Earth can be on different calendar days — even different years on New Year's!

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India's Unique Offset

India Standard Time (IST) is UTC+5:30 — a half-hour offset. This was chosen to split the difference between two ideal time zones. Nepal goes even further with UTC+5:45, the world's only 45-minute offset.

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China's Single Time Zone

China spans 5 geographic time zones, but uses only one (UTC+8) for the entire country. This means sunrise in western China (Xinjiang) can be as late as 10am — making it one of the world's most unusual time zone decisions.

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Daylight Saving Time

About 70 countries observe Daylight Saving Time (DST), moving clocks forward in spring and back in autumn. The USA, Canada, and most of Europe use DST. Countries near the equator (India, China, Japan) do not — the day length doesn't vary enough to matter.

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Why Time Zones Were Invented

Before 1884, every city used solar local time — noon was when the sun was highest. Railroads created chaos: trains couldn't run on schedule when every city had a different time. The US introduced standardized time zones in 1883, adopted globally in 1884 at the International Meridian Conference.

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The International Date Line

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. Cross it heading west and you gain a day; heading east and you lose a day. Kiribati moved the IDL in 1995 to put all its islands in the same date — making it the first country to enter each new year.

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Australia's Half-Hour Zones

Australia has 3 standard time zones including the quirky Australian Central Standard Time (ACST) at UTC+9:30 — a full 30 minutes offset. South Australia and the Northern Territory use this zone, making scheduling meetings across Australia particularly interesting.

📐 How Time Zone Conversion Works

Basic Conversion

All time zones are defined as an offset from UTC (Coordinated Universal Time).

Target Time = Source Time − Source UTC Offset + Target UTC Offset

Example: Convert 3:00 PM New York (UTC-5) to Mumbai (UTC+5:30)
= 15:00 − (−5) + 5.5
= 15:00 + 5 + 5.5
= 25:30 → 01:30 AM next day

UTC as the Common Language

Step 1: Convert source to UTC
UTC = Local Time − UTC Offset

Step 2: Convert UTC to target
Target = UTC + Target Offset

Example: 9:00 AM IST (UTC+5:30) → EST (UTC-5)
Step 1: 9:00 − 5:30 = 3:30 AM UTC
Step 2: 3:30 − 5:00 = 10:30 PM EST (previous day)

Daylight Saving Time (DST)

DST adds 1 hour during summer months in many countries, temporarily changing the UTC offset.

New York (Eastern):
Winter: UTC−5 (EST — Eastern Standard Time)
Summer: UTC−4 (EDT — Eastern Daylight Time)

London (GMT):
Winter: UTC+0 (GMT)
Summer: UTC+1 (BST — British Summer Time)

Crossing Midnight

If result < 0:00 → subtract 1 day, add 24 hours
If result ≥ 24:00 → add 1 day, subtract 24 hours

This is why converting between zones far apart often
results in a different calendar date.

❓ Frequently Asked Questions

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🌍 Time Zone Converter