Bhishma Ekadasi is observed on Shukla Ekadashi in Magh Month (Magha masam). In 2017, Bhishma Ekadashi date is February 7.
It is an auspicious occasion, also considered as the birthday of Vishnu Sahasranama Stotram (Vishnu Sahasranama Stotra Jayanti). Vishnu Sahasranama stotram was revealed to Pandavas by Bhishma. While on the bed of arrows, Bhishma revealed the stothram to Pandavas and became a major reason for their success in Kurukshetra war. Lord Krishna himself told to Pandavas that chanting Vishnus 1000 names will provide success and salvation in life.
Bhishma Ekadasi is celebrated with utmost fervor in Vishnu temple across India and abroad. ISKCON Temples and other Vishnu temples consider it as one of the major festivals. In Andhra Pradesh, ‘Narasimha Kalyanam is observed at Antarvedi Lakshmi Narasimha Swamy temple.
In Annavaram Satyanarayana Swamy Temple, Simhachalam Lakshmi Narasimha Swamy Temple, Yadagirigutta Narasimha Swamy Temple, Bhadrachalam Sri Sita Ramachandra swamy temple, and Tirumala Tirupati Sri Balaji temple, Bhishma Ekadasi is celebrated in a grand manner. Bheeshmashtami or Bhishma Astami and Bhishma Dwadasi are also celebrated with fervor in all Vishnu temples.
In 2016, Bhishma Ekadashi date was February 18.
In 2015, Bhishma Ekadashi date was January 30.