I live in India and if I call someone in the US in my afternoon I will probably be waking them from their slumber.
Why does this happen?? Well because of time zones.
What are these time zones??
A time zone is an area that observes a uniform standard time for legal, commercial and social purposes.
Why do we need a standard time??
In Britain the followed a local and Railway time. This made people miss trains so they adopted a single standard time used all over the country. Every country can’t have a single standard time because earth is a sphere and sunlight does not cover everywhere.
Each time zone is 1 hour apart. That is if you go one-time zone forward you gain an hour but if you go one-time zone backwards you lose an hour except you don't really gain or lose time.
Time zones don't follow the longitudes, instead, they bend in weird shapes. Standard time can vary on whether the country follows daylight saving or not. Some countries like Kiribati changed their standard time to Australia’s to trade with them.
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