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