Convert a date and time between IANA time zones, accounting for daylight saving time and repeated clock times.
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How to use Timezone Converter
- Enter the date and local time in the source zone.
- Choose source and target IANA zones and select an occurrence for repeated times.
- Review the target date, time and offset, or swap the zones.
Frequently asked questions
Why does the offset between two cities change during the year?
Some locations observe DST on different dates. Conversion uses the full date and IANA zone rules rather than one fixed year-round offset.
Which zone should I select for Beijing time?
Choose Asia/Shanghai for the usual time used in mainland China. The IANA label represents its UTC+8 rules and is not limited to Shanghai.
Can the result fall on the previous or next day?
Yes. Large offsets can change the calendar date. Check the full date rather than copying only the hour when planning meetings or deadlines.
Why can 01:30 have two results during a DST rollback?
Clock rollback can repeat a local time with different UTC offsets. Select the intended occurrence; a skipped spring-forward time is invalid.
Where do time zone rules come from?
They use the IANA time zone data available. Older browser or OS data may miss recent rule changes; check official local time for travel near a change.