The Nanakshahi calendar (Punjabi: ਨਾਨਕਸ਼ਾਹੀ ਜੰਤਰੀ ) is a tropical solar calendar used in Sikhism. It is based on the "Barah Maha" (Twelve Months), a composition composed by the Sikh gurus reflecting the changes in nature conveyed in the twelve-month cycle of the year.W. H. McLeod (2009). The A to Z of Sikhism . Scarecrow Press. The year begins with the month of Chet, with 1 Chet corresponding to 14 March. The reference epoch of the Nanakshahi calendar is the birth of Guru Nanak Dev, corresponding to the year 1469 CE.Singh, Jagraj (2009). A complete guide to Sikhism . Unistar Books.
