context: The Xuanwu Gate Incident (Hanzi: 玄武门 之 变, pinyin: Xuanwumen zhi bian, July 2, 626) was an incident which was the culmination of the Tang Dynasty family intrigue among the sons of Emperor Tang Gaozu (Li Yuan) namely the crown prince, Li Jiancheng and Li Shimin. Li Jiancheng, who was jealous of Li Shimin, intended to kill him, but Li Shimin, who had kissed this plan, took the preliminary action by ambushing Li Jiancheng at the Xuanwu gate, the gate leading to Emperor Gaozu's palace. There Li Shimin killed his brother and also his younger brother, Li Yuanji, who supported Li Jiancheng. After that he sent troops to the palace to face his father. Under intimidation, Emperor Gaozu gave the crown prince status to Li Shimin and abdicated two months later and gave his throne to his second son. This bloody event occurred in Chang'an (now Xi'an, Shaanxi Province)
question: When did the Xuanwu Gate Incident occur?
answers.text: July 2, 626