Time Zone Converter
Convert a local date and time from one IANA time zone to another. Daylight saving is applied from timezone data, not from hardcoded calendars.
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Frequently asked questions
How is timezone conversion calculated?
A wall-clock date and time is interpreted in the source IANA time zone, converted to an instant in UTC using that zone’s offset (including DST), then formatted in the target zone.
What is the difference between UTC and GMT?
UTC is the atomic civil time standard. GMT is a historical term for mean solar time at Greenwich and, in the UK, the winter civil offset of Europe/London. For most conversion purposes they match at UTC+00:00, but UK summer time is BST, not GMT.
Why does the time change with daylight saving?
Some regions move clocks forward in warmer months. IANA timezone data encodes those transitions. This converter does not hardcode DST start dates.
How do I convert time between cities?
Choose a source city or zone, enter the local date and time, then choose a destination. You can share the result URL so others see the same conversion.