What Is The Largest Possible International Time Difference?

The maximum is 24 hours. There is a line drawn which lands in the sea where ships gain or lose a whole day by crossing

The largest possible time difference is 25 hours. Quite interesting when our day is only 24 hours :-) Anyway here is the scenario.

Current time in Nuku'Alofa is July 15 11:15 pm and that in International Data Line (West) is July 14 10:15 pm. You can verify it just by checking the two extreme time zone in your Desktop's   Date/Time application.

-SRC

Largest possible time difference is 24 hrs.  From New Zealand and the Samoa Islands.  Each reside on either side of the international date line.  In other words you cross it you gain or lose a day, depending on which side youre coming from.  Interesting

25 (or 26 hours considering also maritim time zones and inhabited places)

The largest possible international time difference is one day. In the far west when it is midday, it is the following midday in the far east.

20 hours,
Between Alaska and Wellington in New Zea land.

I would have thought that it could only be 12 hours. After that, you are coming back to the point from where you started. Although there are 24 time zones, if you travel east or west then you are still only 12 time zones away from your destination.

I think it's 23 hours, if you take a look at New Zeland and Hawaii, the time difference is 23 hours.

The biggest time zone shift possible is crossing from Afghanistan to China via the Hindu-Kush - a time change of 3 and half hours..