The significance of standard meridian of India is that Standard meridian is used as the standard time for whole country. If it isn't there chaos will be created in the country so standard time is very important.
Country Standard Time was created in 1992.
Pakistan Standard Time is Taken From a Village "Masroor" of Tehsil Shakargarh and District Narowal.
Before the 1880s, every city had its own time. As transportation and communication started getting faster, that started getting more and more confusing.
The standard meridian is taken as 82'30 Degrees. It is taken because it passes near Allahabad whicf lies almost at the center of the country.
it is necessary to adopt the local time of some central meridian because each degree of longitude differs by 4 minutes.so if we follow the time of each meridian it would be very difficult as the people in the same country will have different time and the people travelling around would have to change there time now and then.therefore a central meridian in the country is taken as the standard meridian and the whole country follows its time.
Pakistan
The first country to adopt a standard time was the Netherlands in 1835.
Because it is full of energy for any country of the world
India is situated from west to east in about 30 longitudes . It takes4 minutes to cross a longitudes . India is situated between 67 degree E to 97 degree E. Hence there is a two hours difference in the timings of the western most extreme extremity and the easternmost extremity if there is no standard meridian in India we have to advance our watch by 4 minutes on each longitude, if we travel from west to east . In order to avoid the problem we have chosen 82 degree 30 E as standard meridian and its local time is taken a standard throughout the country.
Nepal
most areas have been taken over by an imperialist country, at some point in time (even if that country does/did not admit to being imperialist).