Question

how is time of location decided​

Answer 1

The ubiquitous GPS system we all use today to determine location uses very accurate measurements of time, triangulated between satellites orbiting the earth and your position on the ground. This is possible with atomic clocks accurate to less than 1 microsecond

Answer 2

Answer:

The ubiquitous GPS system we all use today to determine location uses very accurate measurements of time, triangulated between satellites orbiting the earth and your position on the ground. This is possible with atomic clocks accurate to less than 1 microsecond.