Question

who can we decide standardtime
ofa country

Answer 1

Standard time of the place is determined by the distance of meridian of a place from the prime meridian. It is actually the official local time that is followed throughout the country. For a country, the standard time remains the same irrespective of its longitudinal differences and is even regarded as the time zones.

Answer 2

The world meeting is held for that and a seperate "World geographical government" is there to decide