Time tools
World Time and Time Zone Converter
Convert a local time between IANA zones with daylight-saving and date-line handling.
A correct time-zone conversion identifies one real instant and projects it into the target zone. New York is 13 hours behind Beijing during standard time but 12 hours behind during daylight time, so a fixed year-round offset is wrong. This tool uses IANA rules and shows the target UTC offset and date change.
Time tools
Use IANA names such as Asia/Shanghai and America/New_York. Nonexistent DST-gap times move forward compatibly; repeated fall-back times use the earlier valid instant.
Frequently asked questions
Why does a city offset change?
Some regions observe daylight saving, and transition dates can vary by policy and year.
Can I enter UTC+8 only?
A fixed offset cannot represent historical or future daylight rules, so an IANA city zone is preferred.