2030
Monday, 28 October 2030
In 2030 the tithi runs from 10:37 pm on 27 Oct to 7:22 pm on 28 Oct; it is running at aparahna, the afternoon on Monday, 28 October 2030, so that is the day of Bhai Dooj.
2031
Sunday, 16 November 2031
In 2031 the tithi runs from 12:29 am on 16 Nov to 10:00 pm on 16 Nov; it is running at aparahna, the afternoon on Sunday, 16 November 2031, so that is the day of Bhai Dooj.
How the date is fixed
Bhai Dooj falls on the second day of the bright half of the lunar month Kartika (Shukla Dwitiya). The date is the day on which that tithi is running at aparahna, the afternoon.
About
Bhai Dooj falls on the second tithi of the bright half of Kartika, two days after Diwali, in October or November. It is Yama Dwitiya, the day Yama is said to have visited his sister Yamuna, and the aparahna (afternoon) is the governing period, so the day whose afternoon carries Dwitiya is chosen. Sisters mark their brothers' foreheads and feed them; in Bengal it is Bhai Phonta, in Nepal Bhai Tika, and in Maharashtra Bhau Beej. The Kayastha community keeps Chitragupta Puja on the same day.
How it is observed
Sisters apply tilak to their brothers in the afternoon and share a meal; a bath in the Yamuna is traditional at Mathura.