Spotify doesn’t have a date yet.
From a recent Spotify earnings call (Q2 2018), the CEO of Spotify says:
Obviously it’s the big markets like Russia, India that probably will contribute the most. I don’t have any further comment on any specific launch dates on those things.
They have already set up an office in Mumbai last year, and appointed the former OLX CEO Amarjit Singh Batra as Spotify India’s head. But the launch had hit music label resistance. Considering the current challenges, Spotify may be launching in October or November this year.