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How to convert a time zone
Enter the source wall-clock time, then select the source and destination IANA time zones.
Enter the local date and time
Set the date and clock time as they appear in the source location.
Choose both locations
Select a source IANA zone and the destination IANA zone from the vertically stacked controls.
Handle daylight-saving ambiguity
If a time occurs twice when clocks move back, select the earlier or later occurrence and read the destination time and UTC instant.
Frequently Asked Questions
What is an IANA time zone?
It is a location-based identifier such as Europe/London with historical and current offset rules.
Does this account for daylight saving?
Yes. It uses the time-zone rules supplied by your browser.
Why can a local time be rejected?
During a spring clock change, some local wall-clock times do not exist.
How are repeated times handled?
Choose the earlier or later occurrence when a time occurs twice during an autumn clock change.
What does the UTC instant mean?
It is the single global timestamp shared by both displayed local times.
Can the destination date change?
Yes. A conversion can move to the previous or next calendar day.
Which zones are available?
The tool presents commonly used IANA zones supported by your browser.