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According to the Sikh Nanakshahi calendar, this day marks the birth of the tenth and final Sikh prophet-teacher. Guru Gobind Singh introduced many of the customs that Sikhs practise today including the 5 K's.
Guru Gobind Singh, the tenth Sikh guru, was born Gobind Rai in Patna, Bihar on 22 December 1666 CE. His birthday generally falls in December or January—or occasionally twice within one year—when calculated according to the Hindu Bikrami calendar