Arrival time calculator
Convert a flight time with exact UTC offsets.
Start with one local departure clock. Add the UTC offsets and elapsed duration you verified, then see the destination date and clock without letting your browser guess the time zone.
Your entries
Arrival Clock Calculator
Every field starts blank. Use signed offsets such as
+02:00, -09:00, or
+05:30. An offset applies to one instant, not
a permanent label for a city.
Calculated clock
The clock is still missing information.
No destination arrival yet
Enter both exact UTC offsets.
- Departure instant
- Waiting for the departure details
- Arrival instant
- Waiting for a complete entered duration
- Calendar movement
- Waiting for a complete calculation
Formula
Departure local clock - origin offset + elapsed duration + destination offset.
Missing or invalid entries
- Every field is blank.
This result uses only your entries. It does not check a live schedule, time zone, or daylight-saving rule.
How it works
An offset belongs to an instant.
RFC 3339 defines a numeric offset as local time minus UTC. That is why the first step subtracts the origin offset. After the entered duration is added on the UTC line, the destination offset is added to express the result on the destination local clock.
The signs matter. A departure at 18:50 with an offset of
-04:00 corresponds to a later UTC clock, while a
positive offset corresponds to an earlier UTC clock. Keep the sign
attached to the number you verified.
Do not reuse a winter offset for a summer date, or assume one abbreviation has one global meaning. IANA records transitions because civil-time rules can vary. NIST also notes that separate jurisdictions decide these rules and can change them with little notice.
The calculator rejects -00:00. RFC 3339 uses that form
when the offset is unknown. Use +00:00 only when UTC
itself is the verified local reference for that instant.