Notes: All timings are represented in 24+ hour notation in local time of Fairfield, United States with DST adjustment (if applicable).
Hours past midnight are higher than 24:00 and fall on next day. In Panchang day starts and ends with sunrise.
On Rigveda Upakarma day, Brahmins ritually change their Upanayana thread along with Shrauta rituals. Upakarma which is a Vedic ritual is still practiced by Hindus of Brahmin caste.
Upakarma is known as Avani Avittam in Tamil Nadu. The next day of Avani Avittam is known as Gayathiri Japam.