Guru Gobind Singh's birthday, also known as Guru Gobind Singh Jayanti, is celebrated every January 5. This Sikh holiday honors the tenth and last Sikh Guru, who was born on December 22, 1666, according to the Gregorian calendar. The celebration is observed worldwide, with official recognition in Indian states such as Haryana, Jammu and Kashmir, Punjab, and Rajasthan, where it is often celebrated according to the lunisolar Vikram calendar. Guru Gobind Singh became the leader of the Sikhs at the age of nine and is remembered as a warrior, spiritual master, and poet. He participated in numerous battles against the Mughal army and left no successor due to the deaths of his four sons during the Mughal-Sikh Wars. Instead, he declared the Guru Granth Sahib as the eternal living Guru before his death. The holiday typically involves prayers, hymns, and community gatherings among Sikhs.