Time between local dates
Subtract two local date-times within the same time zone. Include the date when a journey crosses midnight.
Understand the numbers · Make life easier
Flight duration across time zones
Find elapsed time using each endpoint's local clock and selected city time zone. Change the arrival date when a flight crosses a calendar day.
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Actual elapsed time
14hours
Change the arrival date for an overnight flight. Results use the selected time zones and are not a flight timetable.
Departure in UTC2026-01-01T02:00:00.000Z
Arrival in UTC2026-01-01T16:00:00.000Z
Worked steps
- Convert both local date-times to UTC using each city's time zone and daylight-saving rules for that date.
- Arrival UTC − departure UTC; the clock-face difference alone is not flight duration.
Supports the 12 listed cities and years 2000–2100, converting to UTC with the browser's built-in IANA time-zone rules. Does not simply subtract local clocks. Nonexistent or ambiguous daylight-saving times are refused; use a confirmed unambiguous time. Rules depend on browser version and may change with government policy. Does not look up flights, predict delays or determine connection safety.
Method and scope
Local dates are converted to UTC using the browser's IANA time-zone rules, then subtracted. This handles zone offsets rather than simply subtracting the two clock readings.
Daylight-saving transitions can make local times nonexistent or repeated. Such ambiguous endpoints are rejected; use a confirmed unambiguous time.
Only the listed 12 cities and years 2000-2100 are supported. Rules depend on browser data and future governments may change them; this does not look up flights, predict delays or assess connection safety.
References:IANA: time-zone and daylight-saving data
What this helps you do
Find elapsed time using each endpoint's local clock and selected city time zone. Change the arrival date when a flight crosses a calendar day.
What to enter
Start with departure local date and time, then fill the other relevant fields in the units shown. The field hints explain the required format and examples.
How the calculation works
Local dates are converted to UTC using the browser's IANA time-zone rules, then subtracted. This handles zone offsets rather than simply subtracting the two clock readings.
Worked example
Departure from Taipei at 2026-11-03 09:00 and arrival in Tokyo at 2026-11-03 13:00 gives three hours elapsed. Tokyo is one hour ahead of Taipei on that date.
Understanding the answer
Daylight-saving transitions can make local times nonexistent or repeated. Such ambiguous endpoints are rejected; use a confirmed unambiguous time.
Scope and limitations
Only the listed 12 cities and years 2000-2100 are supported. Rules depend on browser data and future governments may change them; this does not look up flights, predict delays or assess connection safety.