Time Zone / UTC Converter

How the time zone converter works

Time zones are stored as named regions from the IANA time zone database, such as America/New_York or Europe/London, rather than fixed offsets like UTC−5. Each region records its history of offset and daylight saving changes, so the converter can apply the rules in force on the date you enter.

To convert, it works out the exact moment your date and time represents in the "from" zone, then shows that moment in the "to" zone.

Worked example

9:00 AM on 15 July 2026 in New York (UTC−4 in summer) is 1:00 PM UTC, 2:00 PM in London, 10:00 PM in Tokyo and 11:00 PM in Sydney.

UTC offsets in winter and summer

Sydney's clocks go forward in the southern-hemisphere spring, so its daylight saving time covers January.

Daylight saving time changes

In the US, clocks go forward at 2:00 AM on the second Sunday in March and back at 2:00 AM on the first Sunday in November. In the UK and the European Union they change on the last Sundays of March and October, so for a few weeks each year the gap between New York and London is an hour shorter than usual.

Two kinds of time need special handling:

• Skipped times. When clocks go forward, an hour doesn't exist - in New York on 8 March 2026, 2:00 to 2:59 AM is skipped. If you enter a time in that gap, the converter moves it forward by the gap (2:30 AM becomes 3:30 AM), as most calendar apps do.
• Repeated times. When clocks go back, an hour happens twice - in New York on 1 November 2026, 1:00 to 1:59 AM occurs first in daylight time, then again in standard time. The converter uses the first occurrence.