All muhurats
Sharad Navratri is the nine nights from Ashwin Shukla Pratipada to Navami, the best known of the four, ending in Vijayadashami. Ghatasthapana falls on the first of these days. Being counted in tithis, a kshaya or adhik tithi shifts its length against the Gregorian calendar.
Auspicious window
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10Oct10 Oct → 20 OctSaturday
All times are IST, computed for Ujjain. A tithi or nakshatra turns at the same instant everywhere, so your timezone changes only the clock it reads — but a window bounded by the weekday also follows your own sunrise. The app computes both for your city.