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Calculation Machine

Time Zone Difference Calculator

Local arrival time and the best window to call.

Reviewed by James Whitfield · How we check our maths

Your values

ⓘ Live results

Results
Local arrival time
08:00 (+1 day)
Time difference
+6 h
Direction
Eastward — expect harder jet lag
Good calling window (your time)
03:00 – 11:00
Recovery estimate
4 days

Quick answer

Local time at the destination = departure time + flight duration + (destination UTC offset − origin UTC offset).

The formula

Arrival local = depart + duration + (offset₂ − offset₁)

Worked example

Worked example

Using the values the calculator loads with.

Inputs

  • Departure time (24 h clock)18 h
  • Departure minutes30 min
  • Origin UTC offset-5 h
  • Destination UTC offset1 h
  • Flight duration7.5 h

Result

  • Local arrival time08:00 (+1 day)
  • Time difference+6 h
  • DirectionEastward — expect harder jet lag
  • Good calling window (your time)03:00 – 11:00
  • Recovery estimate4 days

How to use the Time Zone Difference Calculator

  1. 1Enter the departure time on a 24-hour clock.
  2. 2Enter both UTC offsets — remember daylight saving changes them.
  3. 3Add the flight duration in hours.

Frequently asked questions

Do I need to allow for daylight saving?

Yes. Offsets shift by an hour in spring and autumn, and the two countries rarely change on the same date.

Why is eastward travel harder?

The body clock naturally runs slightly longer than 24 hours, so delaying sleep (westward) is easier than advancing it (eastward).

About this calculator