How to convert a wall clock between IANA time zones
Treat 3 p.m. as civil time in a named zone, convert through UTC, and format in the destination — including DST on that date.
Name the zone, not the abbreviation
“3 p.m. EST” is ambiguous; EST is used in more than one region. IANA names such as America/New_York, Europe/London, and Asia/Ho_Chi_Minh are the identifiers operating systems and JavaScript Intl use. Toolora treats the datetime-local field as wall time in the source zone, converts that instant to UTC with the offset that applies on that calendar date (including daylight saving), then formats the same instant in the target zone. Asia/Ho_Chi_Minh is UTC+7 all year. Europe/London switches. Example: 5 September 2026 09:00 UTC is 16:00 in Ho Chi Minh City.
DST edges
When clocks fall back, one local hour happens twice; the engine picks an offset. When clocks spring forward, a local hour may not exist. The converter is not a flight-duration tool and not a Unix timestamp parser — use Timestamp Converter for epoch seconds. City labels in the list replace underscores with spaces; search for the IANA path.
Related date tools
Shifting a calendar date by months does not apply DST; that is Date Calculator. Counting civil days between two dates is Days Between Dates. Age on a filing date is Age Calculator. None of those convert 9:00 in New York to London.
Privacy
The page does not read GPS and does not upload times. Close the tab to clear the fields. Related: Timestamp Converter for Unix times, Date Calculator for calendar arithmetic without zones. Common mistakes: typing a Unix epoch into this page (use Timestamp Converter), using EST instead of America/New_York, and expecting flight duration. DST gaps can make a local hour missing or repeated — the engine picks an offset. City labels replace underscores; search the IANA path. Related guide: /guides/how-to-convert-unix-timestamps.