One zone, no clock changes, and a half-hour offset that trips up the rest of the world.
India runs entirely on India Standard Time (IST), UTC+5:30 — from Mumbai to Kolkata, Delhi to Chennai, one clock covers the whole country. There is no daylight saving, so IST never moves.
| City | vs IST (winter) | vs IST (their summer) |
|---|---|---|
| New York | -10:30 | -9:30 |
| London | -5:30 | -4:30 |
| Dubai | -1:30 | -1:30 |
| Singapore | +2:30 | +2:30 |
| Tokyo | +3:30 | +3:30 |
| Sydney | +4:30 | +5:30 |
Every shift in these gaps comes from the other country’s daylight saving — India never changes.
From the US: India’s evening (6–8 PM IST) matches US East Coast morning — the classic overlap. From the UK/EU: India’s afternoon overlaps Europe’s morning generously. From Singapore/Japan/Australia: India’s morning matches their midday.
IST is based on the 82.5°E meridian — the midpoint of a country spanning two hours of solar time. We cover the history in Why is India 30 minutes off? and the single-zone debate in Why does India have one timezone?
Live clock, sunrise times, and city comparisons: Time in India.
India Standard Time (IST), UTC+5:30, covering the entire country year-round with no daylight saving.
It depends on the US zone and season: 9:30–10:30 hours behind IST for the East Coast, up to 12:30–13:30 for the West Coast.
Ahead — by 5 hours 30 minutes when London is on GMT (winter) and 4 hours 30 minutes during British Summer Time.