All countries relate their time to "Universal Time(UT)". UT is based on the rotation of the Earth and is a modern continuation of Greenwich Mean Time (GMT).
Sandford Fleming of Canada proposed a world-wide standard of time measurement in 1897, and by 1900 all countries adopted the system, which is used today.
Most of the countries follow a standard time because it is very difficult to administer a country through local times.
Two countries India and SriLanka
Most countries use the Arabic (or Hindu-Arabic) numeral system. It is the standard number system we use all the time.
PST stands for Pacific Standard Time and the countries that are in the pacific standard time zone include parts of North America, Canada and Mexico. There are several other time zones throughout the world.
because if there is no standard time then there will be confusipns in the rail way airlines country as different countries have many time zones
Yes
The world is divided into different time zones (In the US, you may see Eastern Standard Time or Central Standard time, etc) Indian Standard time is the common time zone for all of India.
standard unit of time
Each research station bases its time clocks in the country that supports the station. There is no standard time in Antarctica.
Antarctica has no standard time zone(s). Research stations operate on the time zone of their support staffs in their home countries.
There are no countries today that are using the gold standard.