Explain simply why On the night of October 1 , 2017 is the correct answer to: Passage: On the night of October 1, 2017, a gunman opened fire on a crowd of concertgoers at the Route 91 Harvest music festival on the Las Vegas Strip in Nevada, leaving 58 people dead and 546 injured. Between 10: 05 and 10: 15 p.m. PDT, 64-year-old Stephen Paddock of Mesquite, Nevada, fired hundreds of rifle rounds from his suite on the 32nd floor of the nearby Mandalay Bay hotel. About an hour after Paddock fired his last shot into the crowd, he was found dead in his room from a self-inflicted gunshot wound. His motive is unknown.

Question: Based on this passage, when did the shooting in las vegas happen 2017?. Explanation:
To answer the above question, the relevant sentence is: On the night of October 1, 2017, a gunman opened fire on a crowd of concertgoers at the Route 91 Harvest music festival on the Las Vegas Strip in Nevada, leaving 58 people dead and 546 injured.