2012
- Friday, 6 January 2012 · Shukra Pradosh (Shukla)
- Friday, 20 January 2012 · Shukra Pradosh (Krishna)
- Sunday, 5 February 2012 · Ravi Pradosh (Shukla)
- Sunday, 19 February 2012 · Ravi Pradosh (Krishna)
- Tuesday, 6 March 2012 · Bhauma Pradosh (Shukla)
- Monday, 19 March 2012 · Soma Pradosh (Krishna)
- Wednesday, 4 April 2012 · Budha Pradosh (Shukla)
- Wednesday, 18 April 2012 · Budha Pradosh (Krishna)
- Thursday, 3 May 2012 · Guru Pradosh (Shukla)
- Friday, 18 May 2012 · Shukra Pradosh (Krishna)
- Saturday, 2 June 2012 · Shani Pradosh (Shukla)
- Saturday, 16 June 2012 · Shani Pradosh (Krishna)
- Sunday, 1 July 2012 · Ravi Pradosh (Shukla)
- Monday, 16 July 2012 · Soma Pradosh (Krishna)
- Monday, 30 July 2012 · Soma Pradosh (Shukla)
- Wednesday, 15 August 2012 · Budha Pradosh (Krishna)
- Wednesday, 29 August 2012 · Budha Pradosh (Shukla)
- Thursday, 13 September 2012 · Guru Pradosh (Krishna)
- Thursday, 27 September 2012 · Guru Pradosh (Shukla)
- Saturday, 13 October 2012 · Shani Pradosh (Krishna)
- Saturday, 27 October 2012 · Shani Pradosh (Shukla)
- Sunday, 11 November 2012 · Ravi Pradosh (Krishna)
- Sunday, 25 November 2012 · Ravi Pradosh (Shukla)
- Tuesday, 11 December 2012 · Bhauma Pradosh (Krishna)
- Tuesday, 25 December 2012 · Bhauma Pradosh (Shukla)
2013
- Wednesday, 9 January 2013 · Budha Pradosh (Krishna)
- Thursday, 24 January 2013 · Guru Pradosh (Shukla)
- Thursday, 7 February 2013 · Guru Pradosh (Krishna)
- Saturday, 23 February 2013 · Shani Pradosh (Shukla)
- Saturday, 9 March 2013 · Shani Pradosh (Krishna)
- Sunday, 24 March 2013 · Ravi Pradosh (Shukla)
- Sunday, 7 April 2013 · Ravi Pradosh (Krishna)
- Tuesday, 23 April 2013 · Bhauma Pradosh (Shukla)
- Tuesday, 7 May 2013 · Bhauma Pradosh (Krishna)
- Wednesday, 22 May 2013 · Budha Pradosh (Shukla)
- Wednesday, 5 June 2013 · Budha Pradosh (Krishna)
- Friday, 21 June 2013 · Shukra Pradosh (Shukla)
- Friday, 5 July 2013 · Shukra Pradosh (Krishna)
- Saturday, 20 July 2013 · Shani Pradosh (Shukla)
- Sunday, 4 August 2013 · Ravi Pradosh (Krishna)
- Sunday, 18 August 2013 · Ravi Pradosh (Shukla)
- Monday, 2 September 2013 · Soma Pradosh (Krishna)
- Tuesday, 17 September 2013 · Bhauma Pradosh (Shukla)
- Wednesday, 2 October 2013 · Budha Pradosh (Krishna)
- Wednesday, 16 October 2013 · Budha Pradosh (Shukla)
- Friday, 1 November 2013 · Shukra Pradosh (Krishna)
- Friday, 15 November 2013 · Shukra Pradosh (Shukla)
- Saturday, 30 November 2013 · Shani Pradosh (Krishna)
- Saturday, 14 December 2013 · Shani Pradosh (Shukla)
- Monday, 30 December 2013 · Soma Pradosh (Krishna)
How the date is fixed
Trayodashi, the thirteenth day of each half, kept on the day it is running at pradosh, the twilight after sunset. It is named for its weekday: Soma Pradosh, Shani Pradosh and so on.
About
Pradosh vrat is kept twice a month, on the Trayodashi of each fortnight, during the pradosh period of roughly 96 minutes after sunset. The day is chosen so that Trayodashi is running at sunset, even if it is absent at sunrise; when it touches sunset on two days, the first is usually taken. Each weekday gives the observance a name, Soma Pradosh on Monday and Shani Pradosh on Saturday being the ones most often singled out. In Tamil Nadu the Pradosham puja at Shiva temples, with the Nandi abhisheka, is a regular feature of temple calendars.
How it is observed
A fast until dusk and Shiva worship with abhisheka in the pradosh window after sunset.