Guru Nanak Sahib (the First Nanak, the founder of Sikhism) was born on 15th April, 1469 at Rai-Bhoi-di Talwandi in the present distrect of Shekhupura (Pakistan), now Nanakana Sahib. The Birthday of Guru Nanak Sahib falls on Kartik Puranmashi i.e. full moon day of the month Kartik. On this day the Birthday is celebrated every year. The Shrine (Gurdwara) repsesenting the home of Baba Kalu (Father) and Mata Tripta (Mother) is called Gurdwara Janam Asthan, situated at Rai-Bhoi-di-Talwandi in the present district of Shekhupura (now Nanakana Sahib in Pakistan). The Sikhs from all over the world gather here and celebrate the Gurupurab every year with great devotion and enthusiasm.
Guru Gobind Singh Sahib, the tenth Nanak was born at Patna Sahib on 22nd December 1666, (Poh Sudi Saptmi). His birthday generally falls in December or January or sometimes twice within a year as it is calculated according to Hindu Bikrami Calendar based on moon-year. According to Nanakshahi calendar the birth-day of Guru Gobind Singh Sahib falls only once in a year i.e. on 5th January (every year).