NanakShahi Calendar - Sikh Jantri 2018 with list of all Gurpurav's Sangrand, Puranmashi etc. A solar calendar - based on the time it takes for the earth to rotate around the sun. Called Nanakshahi after Guru Nanak - year one is the year of Guru Nanak's birth It is scientifically designed and keeps in precise tune with the sun's position;