Question

answer in brief how is the standard time of a place determined

Answer 1

You need to use a time zone database. I like Current Local Times Around the World. You could also use a time zone map, but many don’t show what places use daylight saving time, and those that do don’t show when it is in effect.

Answer 2

Greenwich Mean Time: The Greenwich Mean Time acts as the standard time for all the time zones in the world. It has a time difference of 0 and is located in Greenwich, England.

It is based on the distance of the Prime meridain.  

The Prime meridian is an imaginary line.

For example,  

Consider India and Brazil,

Time: 6 am in India and 9:30 in Brazil.

Time Difference:

• India is 5 hours 30 minutes ahead of GMT.
• Brazil is 3 hours behind GMT.
• Brazil is 8 hours and 30 minutes behind Indian Standard Time.

So, IF 6 am in India then its 9:30 pm in Brazil.

This is how the standard time of a place is determined.

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