Guru Gobind Singh was born December 22, 1666 A.D.
According to the ancient Hindu Calendar in use at the time, the birth occurred in the Vikram Samvat year of 1723, on the 23rd day of the month of Poh, and the seventh day of Sudi, the light half of the lunar cycle, between the new and full moon.
The babies father Teg Bahadur, the 9th guru, could not be present at the birth because he had gone to Assam during a tour of Eastern India. He left instructions with his wife Gujri to name the infant Gobind Rai Sodhi. Gurjri remained in the care of her brother Kirpal Chand, along with Teg Bahadur's mother Nankee, in Patna, the capital of Bihar, a region of Eastern India. The local Raja, Fateh Chand Maim, built a house for the Guru’s family located on the banks of the Ganges River where they awaited the Guru's return
A gurdwara called Takhat Sri Harmandir Sahib in Patna Sahib is one of five seats of religious authority for Sikhs. It was built to commemorate the birth of Gobind Rai, who later became Gobind Singh, 10th guru of the Sikhs
Guru Gobind Singh’s birthday gurpurab is celebrated by many Sikhs on January 5th, according to the Nanakshahi calendar. Those who adhere to lunar tradition continue to observe his birthday on December 22nd. Festivities take the form of worship and may include reading an akhand paath, singing kirtan and parading in commemorative processions.