It ishigh timethat India did something about the population problem.

(it’s) high time meaning and examples -
used for saying that something should be done soon, because it is already past the time when it should have been done.
- It’s high time we got a pay rise!

(it is) past the time when something should have happened:
- It’s high time you got that bad knee looked at by a doctor!

used to say it is time to do something that should have been done a long time ago.
- It's high time we made some changes around here.

Source: Cambridge, MacMillan and Merriam-Webster dictionary.