Masa Shivaratri is an auspicious day to perform Shiva Puja. It falls on Krishna Paksha Chaturdashi, a day prior to Amavasya or No Moon.
Maha Shivaratri is observed on Masa Shivratri in Magh month as per Marathi, Gujarati, Telugu, and Kannada Calendars; and in Falgun month as per North Indian Hindi calendars.
Masik Shivaratri 2017 dates..
26 January 2017
(Thursday) Masik Shivaratri
24 February 2017
(Friday) Maha Shivaratri
26 March 2017
(Sunday) Masik Shivaratri
24 April 2017
(Monday) Masik Shivaratri
24 May 2017
(Wednesday) Masik Shivaratri
22 June 2017
(Thursday) Masik Shivaratri
21 July 2017
(Friday) Masik Shivaratri
20 August 2017
(Sunday) Masik Shivaratri
18 September 2017
(Monday) Masik Shivaratri
18 October 2017
(Wednesday) Masik Shivaratri
16 November 2017
(Thursday) Masik Shivaratri
16 December 2017
(Saturday) Masik Shivaratri