Utility

Time Zone Converter

Convert time between any two time zones instantly

Converted Time10:01:00
2026-03-07UTC+00:00

2026-03-07 05:01 (New York (ET)) → 2026-03-07 10:01:00 (London (GMT/BST))

Understanding Time Zones: The Basics

Time zones were created in the 19th century to standardize timekeeping across geographically distant regions — before then, every town used local solar time, which made coordinating train schedules nearly impossible. Today, the world is divided into time zones defined as offsets from UTC (Coordinated Universal Time), ranging from UTC-12 to UTC+14.

The Most Common Time Zone Conversions

These are the most frequently searched time zone conversions based on global remote work and business travel patterns:

  • New York (ET) to London (GMT): New York is 5 hours behind London in winter, 4 hours behind in summer (when UK is on BST).
  • New York to Los Angeles: ET is always 3 hours ahead of PT, year-round.
  • London to Dubai: Dubai (GST, UTC+4) is 4 hours ahead of London in winter, 3 hours ahead in summer.
  • New York to Mumbai: IST (UTC+5:30) is 10.5 hours ahead of ET in winter, 9.5 hours in summer.
  • London to Singapore: SGT (UTC+8) is 8 hours ahead of GMT in winter, 7 hours in summer.
  • New York to Tokyo: JST (UTC+9) is 14 hours ahead of ET in winter, 13 hours in summer.
  • Los Angeles to Sydney: AEST (UTC+10) is 17–19 hours ahead of PT depending on DST.

Daylight Saving Time: The Scheduling Trap

Daylight Saving Time (DST) is the single biggest source of confusion in international scheduling. Because different countries start and end DST on different dates — and some countries don't observe it at all — the offset between two time zones can change 2–4 times per year.

For example, the offset between New York and London is NOT constant:

  • Winter (both on standard time): 5 hours
  • US starts DST before UK: 4 hours (for 2–3 weeks in March)
  • Both on DST: 5 hours
  • UK ends DST before US: 6 hours (for 2 weeks in October/November)

This is why it is always safer to use a time zone converter than to calculate offsets from memory.

Best Practices for International Meeting Scheduling

  • Always specify the time zone when sending calendar invites — "3 PM" is meaningless without context.
  • Use UTC as a reference in written communications: "The meeting is at 14:00 UTC" eliminates ambiguity.
  • Find the overlap window for your team's time zones. For US + Europe teams, 8–10 AM Eastern (14:00–16:00 CET) is the most common overlap. For US + Asia teams, early morning Pacific time (e.g., 8 AM PT = 9 PM JST) is often necessary.
  • Rotate meeting times if you have a global team — don't always make the same region wake up early or stay late.

Frequently Asked Questions

How many time zones are there in the world?
There are 24 standard time zones, but in practice more than 40 time zones are used worldwide due to countries choosing offsets that are not full hours (e.g., India uses UTC+5:30, Nepal uses UTC+5:45, and parts of Australia use UTC+9:30). Some islands and territories use even more unusual offsets.
What is UTC and how is it different from GMT?
UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. GMT (Greenwich Mean Time) is a time zone that uses the same offset as UTC (UTC+0). For practical purposes, UTC and GMT are often used interchangeably. The difference is technical: UTC is based on atomic clocks with leap seconds, while GMT is based on the Earth's rotation.
What is Daylight Saving Time (DST) and which countries use it?
Daylight Saving Time (DST) is the practice of advancing clocks by one hour during summer months to extend evening daylight. About 70 countries observe DST. The US observes it from the second Sunday in March to the first Sunday in November. The EU harmonized DST on the last Sunday of March (start) and October (end). Countries near the equator generally do not observe DST.
What time is it in New York when it is noon in London?
During EST (UTC-5), noon in London (UTC+0) = 7:00 AM in New York. During EDT (daylight saving, UTC-4), noon in London = 8:00 AM in New York. During BST (UK summer, UTC+1), the offset changes further. Always use a time zone converter for precision when scheduling across zones with DST.
How do I schedule a meeting across multiple time zones?
Best practice: propose a time in UTC and let each participant convert locally, or use a tool like this one to check the local time for each participant. For teams spanning more than 3 time zones, look for the "overlap window" — typically 9 AM–11 AM Pacific time works for US West/East and parts of Europe; 8 AM–10 AM Singapore time works for Asia-Pacific.
What is the International Date Line?
The International Date Line (IDL) is an imaginary line in the Pacific Ocean, roughly along the 180° meridian, where the date changes by one full day. Crossing it eastward subtracts a day; crossing it westward adds a day. It is why flights from Los Angeles to Tokyo (westward) can arrive on a date two days after departure, while the return trip (eastward) can arrive the same day or even the day before.

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