Capital: New Delhi · One official time zone (IST, UTC+5:30) stretched across roughly 2,900 km of longitude, from Gujarat to Arunachal Pradesh.
India keeps a single official clock, IST, nationwide — but geographically it spans from Gujarat in the west to Arunachal Pradesh in the east, a distance the sun takes roughly an hour and a half to cross. That means Fajr and Maghrib genuinely happen much earlier by the sun in the east than in the west, even though both places read the same clock time.
Most Indian mosques and prayer apps calculate using the University of Islamic Sciences, Karachi convention, the same one used across Pakistan, Bangladesh and Afghanistan — reflecting a shared South Asian calculation tradition rather than a single national authority.
Same clock, different sun position — this is why a Guwahati resident's Fajr can print noticeably earlier in clock-time than a Mumbai resident's on the same calendar day.
City-level pages with live, minute-by-minute Salah times are being added gradually.
Both cities share the same IST clock, but Guwahati sits much further east geographically, so the sun physically rises there well before it rises over Mumbai — the clock just doesn't move to reflect that.
The University of Islamic Sciences, Karachi method is the most widely used across Indian mosques and prayer apps, though some communities and apps default to the Muslim World League method instead — both are close but not identical.
No — India has kept a single fixed offset, IST (UTC+5:30), year-round since independence, with no seasonal clock changes.