2019
Thursday, 12 September 2019
In 2019 the tithi runs from 5:06 am on 12 Sep to 7:35 am on 13 Sep, so it is running at sunrise (the usual rule, called udaya tithi) on two days, Thursday, 12 September 2019 and Friday, 13 September 2019. As in most almanacs, the first is taken.
2020
Tuesday, 1 September 2020
In 2020 the tithi runs from 8:49 am on 31 Aug to 9:39 am on 1 Sep; it is running at sunrise (the usual rule, called udaya tithi) on Tuesday, 1 September 2020, so that is the day of Anant Chaturdashi.
How the date is fixed
Anant Chaturdashi falls on the fourteenth day of the bright half of the lunar month Bhadrapada (Shukla Chaturdashi). The date is the day on which that tithi is running at sunrise (the usual rule, called udaya tithi).
About
Anant Chaturdashi is the fourteenth tithi of the bright half of Bhadrapada, in September, ten days after Ganesh Chaturthi. The day is the Ananta vrata of the Mahabharata, in which Vishnu as Ananta is worshipped and a fourteen-knotted thread tied on the arm. The tithi at sunrise is taken, and the puja is done in the forenoon. It is also the day of Ganesha immersion in Maharashtra and the last day of the Jain Paryushana in the Digambara tradition.
How it is observed
Worship of Ananta with the fourteen-knot thread, and processions carrying Ganesha images to the water for immersion.