Nanakshahi calendar

The Nanakshahi (Punjabi: ਨਾਨਕਸ਼ਾਹੀ, nānakashāhī) calendar is a tropical solar calendar that was adopted by the Shiromani Gurdwara Prabhandak Committee to determine the dates for important Sikh events.The calendar was implemented during the SGPC presidentcy of eminent Sikh scholar Prof. Kirpal Singh Badungar at Takhat Sri Damdama Sahib in the presence of Sikh leadership. It was designed by Pal Singh Purewal to replace the Saka calendar and has been in use since 1998. The epoch of this calendar is the birth of the first Sikh Guru, Nanak Dev in 1469. New Year's Day falls annually on what is March 14 in the Gregorian Western calendar.

The calendar is accepted in about 90% of the gurdwaras throughout the world. There is some controversy about the acceptance of the calendar among certain orthodox sectors of the Sikh world. Some orthodox organizations and factions have not accepted it including many orders dating from the time of the Gurus such as Damdami Taksal, Buddha Dal Nihungs, Takhats etc.