Time Zone Converter

Convert a date and time from one time zone to another, with daylight saving time handled automatically. Pick a time, a source zone and a target zone. Example: 9:00 AM in New York is 2:00 PM in London in winter, a 5-hour gap that shrinks to 4 hours for a few weeks each spring and autumn when the two regions change clocks on different dates.

How to use the Time Zone Converter

1. Pick the date and time (it starts at your current time).
2. Choose the time zone you are converting from and the one you are converting to.
3. Press Calculate to see the converted time and the same moment in other major zones.

Formula and method

A time zone is an offset from Coordinated Universal Time (UTC), such as UTC−5 for New York in winter. Target time = source time − source offset + target offset. Offsets change with daylight saving time (DST), so the calculator looks up the offset that applies on the date you enter. The United States moves clocks on the second Sunday in March and the first Sunday in November; most of Europe changes on the last Sundays of March and October, so the gap between the two shrinks for a few weeks each spring and autumn.

Time difference from New York (winter, standard time)

Scheduling across time zones

For a meeting that works across continents, find the overlap of normal working hours. New York and London overlap from 9:00 AM to 12:00 PM Eastern (2 to 5 PM in London). New York and Tokyo have no working-hours overlap, so one side usually meets early or late. Always give meeting times in both zones or in UTC to avoid confusion around daylight saving changes.

Countries with half-hour and 45-minute offsets

Some zones are not whole hours from UTC: India is UTC+5:30, Iran UTC+3:30, Afghanistan UTC+4:30, Nepal UTC+5:45 and parts of Australia UTC+9:30. The converter uses the IANA time zone database, which handles these correctly.

Popular time conversions (standard time, no daylight saving)

“+1” means the next calendar day. These columns use standard time. During daylight saving time the gap changes by one hour, so use the converter for an exact date.

Time zone abbreviations

When daylight saving time starts and ends

Arizona (except the Navajo Nation), Hawaii, most of Asia, most of Africa and most equatorial countries do not change their clocks.

The International Date Line

The International Date Line runs roughly along the 180th meridian. Crossing it from east to west adds a calendar day, so a flight leaving Tokyo on Monday morning can land in Los Angeles on Sunday evening. When you convert across the Pacific, check the date in the result as well as the time.

Frequently asked questions

How do I convert time zones?

Pick the date and time, choose the source zone and the target zone, and read the result. The tool applies each zone’s daylight saving rules for that date.

What is UTC?

Coordinated Universal Time, the global reference that all time zones are measured from. It does not observe daylight saving time.

What is the difference between GMT and UTC?

For everyday use they show the same time. GMT is a time zone used in the UK in winter; UTC is the precise time standard.

What is the difference between EST and EDT?

EST is Eastern Standard Time (UTC-5) in winter. EDT is Eastern Daylight Time (UTC-4) in summer.

What time is it in London when it is 9 AM in New York?

2 PM in London, a 5-hour difference. For a few weeks each spring and autumn the gap is 4 hours because the US and UK change clocks on different dates.

Which US states do not use daylight saving time?

Hawaii and Arizona (except the Navajo Nation), plus US territories such as Puerto Rico.

How many hours is India ahead of New York?

10 hours 30 minutes in winter and 9 hours 30 minutes during US daylight saving time. India does not change its clocks.

Why is the difference sometimes an hour off?

Different regions change their clocks on different dates, so the gap between two zones can change for a few weeks each year.

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