India time now is shown above in Indian Standard Time, the single zone used across the whole country. IST runs at UTC+05:30 all year — India does not observe daylight saving, so the offset never changes and the arithmetic to any other zone stays constant except when the other side shifts.
One clock from Gujarat to Arunachal Pradesh
India spans roughly two hours of solar time from its western to eastern edge, yet keeps a single clock referenced to the 82.5°E meridian near Mirzapur. The practical consequence is early sunrises in the northeast and late ones in the west — the long-running argument covered in why India has one time zone.
The half-hour offset
IST's :30 offset is what makes India conversions feel awkward: the gap to most zones is never a whole number of hours. The IST converter removes the mental arithmetic, and half-hour offsets explains why they exist at all.