Based on data from Down Detector, the outage impacted the west coast of the United States around 9:17 pm ET. Many individual reports show the outage ending on the west coast not too long afterward.
However, Down Detector shows more sweeping outages hitting the Asia-Pacific region, including Japan and Australia. Those outages were ongoing Monday night in the States and very early Tuesday morning in the areas the outages were taking place.
The outage provided endless fodder for complaints and jokes across Twitter.