Gangotri, Uttarakhand, India keeps Asia/Kolkata time. Every Vedic daily timing here, the Panchang, Rahu Kaal, Choghadiya and Muhurat, is built from Gangotri's own sunrise and sunset, not a single all-India (IST) table, so it is specific to Gangotri and shifts a little each day. Even within India, Gangotri's sunrise is not identical to Delhi's, so the daily windows shift accordingly. The live panel on each page is recalculated daily for Gangotri.
The live panel shows today's tithi, nakshatra, yoga, karana and vaara for Gangotri, updated daily.
The Panchang depends on local sunrise, and Gangotri's sunrise differs, so its tithi/nakshatra timings are specific to Gangotri.
Astronomically precise Rahu Kaal timings for 25 major Indian cities.