Time Zones

Time Zone Converter

Convert a date and time between time zones, with daylight-saving aware results and a world map view.

Time To Convert

Choose the source date, time, and time zone, then pick the time zone you want to compare it with.

DateThe browser sets this to today's date when the page opens.TimeThe browser sets this to your current local time when the page opens.From time zoneDefaults to your browser time zone where it can be detected.To time zone

From02 Sept, 12:00London, United Kingdom

To02 Sept, 07:00New York, United States

Offset difference5 hours behindUTC+01:00 to UTC-04:00

Time zone map

Shows the selected source and target time zones on an atlas-style world map with UTC offset bands.

FromTo

From02 Sept, 12:00London, United Kingdom - UTC+01:00

To02 Sept, 07:00New York, United States - UTC-04:00

Converted time

Source time zoneLondon, United KingdomWed, 02 Sept 2026, 12:00 BST

Target time zoneNew York, United StatesWed, 02 Sept 2026, 07:00 GMT-4

Calendar dayCompared with the source time zone date.Same calendar day

Time zone details

Source UTC offsetEurope/LondonUTC+01:00

Target UTC offsetAmerica/New_YorkUTC-04:00

Instant in UTCSame moment expressed in UTC.Wed, 02 Sept 2026, 11:00 UTC

Assumptions

Calculation notes

Defaults are set in the browser using the visitor's local clock and IANA time zone where available.
Time zone conversion uses the JavaScript Intl time zone database available in the user's browser or server runtime.
If a local clock time falls inside a daylight-saving transition, the browser runtime resolves the nearest valid instant.

Timezone handling

How the conversion avoids fixed offsets

Named time zones are used so daylight-saving changes can be handled for the selected date.

Instant conversion

The converter uses named IANA time zones rather than fixed hour offsets, so daylight-saving changes are handled by the browser/runtime date engine.

It shows the source and destination time together and plots selected places on the map for orientation.

Timezone pathsource local date and time + source timezone -> instant in time -> destination timezone display

London to New York

Example: London to New York

Source: London
Destination: New York
Date and time: selected by user

Result: The output shows the equivalent local time in both places using the correct GMT, BST or daylight-saving offset for that date.

Named time zones are safer than manually adding or subtracting hours, especially around clock changes.

Why named zones matter

Timezone rules can change by jurisdiction, so current browser/runtime timezone data matters.
For flights, broadcasts or legal deadlines, check the original source schedule as well.

Content reviewed: 7 September 2026.

IANA time zone database How TallyKind works

Guide