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Its advantage is that one can travel in the whole country without any problem of time. All incidents taking place in the country can be reported without changing time. And disadvantage is that such a vast country has a single time zone making the difference between the natural timing of different phenomena in different parts of the country
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India has chosen 82 30' as standard meridian and has taken its local time as the standard time of the country.
This has enabled in the uniformity of time in the entire country.
It enables people to have same working hours , with whole country operating at the same time.
It is convenient that one need not set the time while travelling in the country.

It becomes a disadvantage for north eastern states which witness early sunrise.
Thus , it amounts to less daylight to them, as they experience dark early in the evening.