Because they are in different places throughout the world, and time cannot be the same everywhere at once.
Spain and Germany are in the same time zone. There is no difference between the two countries.
there is no time difference between Malaysia and Philippines. =)
There is never a time difference between Japan and South Korea; the time is both countries is UTC + 9 hrs.
The time difference is three and a half hours at the border between Afghanistan and China.
there both different countries
In a perfect world, you could divide the difference between their longitudes by 15°/hr, but some countries have implemented rather unconventional time zone rules.
There is never a time difference between Singapore and the Philippines. 8 PM SGT = 8 PM PHT
The longest time difference would be between Tonga and Samoa. They can be 24 hours apart but are only 550 miles / 887km apart in distance.
The European nations of Spain and Ireland are both located along the Atlantic coast of the continent. The time difference between the two countries is 1 hour.
There is no time difference between them.
Development.
different countries