Vishnupathi Punya Kaalam is an auspicious period dedicated to Lord Vishnu. In 2011, the first Vishnupathi Punya Kaalam is on February 13. There are four Vishnupada Parva Punyakala days in a traditional Hindu calendar and this is more closely associated with Tamil Vaishnava culture. A particular period on the day is considered highly auspicious for worshiping Narayana (Lord Vishnu).
The belief is that Lord Vishnu performed numerous divine actions essential for the welfare of the universe during the Vishnupada Parva Punyakala. Some people also believe that the prayers and pujas offered during period helps in attaining Moksha.
The period of Vishnupathi Punya Kaalam usually occurs the first day of particular Tamil months.