How does the local time differ from place to place? Why do most of the countries have aparticular localstandard time?

Explanation:

1)the local time differ from place to place because the local time of a place is decided by the overhead sun. this is the reason why the local time of a place differ from each other .

2)

most of the countries have aparticular local standered time because the people won't be able to set his/her watch according to the local time of that place .So the people had decided that we have our local standered time .This is the reason why most of the countries have aparticular local standered time.