Today, 19 February 2012 is Pradosh Vrat. As it falls on Sunday, it is also known as Bhanu Pradosh Vrata. It is Krishna Paksha Trayodasi in Falgun month as per North Indian Hindi calendars and Magh month as per Marathi, Telugu, Kannada & Gujarati calendars.
Pradosh Shiv Puja time is 4.30 to 6 in the evening. Pradosha Ashtakam is chanted during Pradosh Shiv Pujan.