Every Daytona 500 between 2006 and 2010, as well as the 2012 and 2014 races, ended under the lights. The changing track conditions caused by the onset of darkness in the closing laps in these years forced the crew chiefs to predict the critical car setup adjustments needed for their final two pit stops. The 2007 race was the first Daytona 500 to go into prime-time, ending at 7:07 p.m. Eastern time. In 2010, the race moved back to a 1:00 p.m. start time, which should have resulted in it ending in daylight; however, two red flags caused by track surface issues led to long delays that pushed the race to 7:34 p.m. EST, pushing the race into prime-time for the second time. The 2012 race was also scheduled to start at 1:00 p.m. EST on Sunday, February 26, but heavy rain in the area caused the race to be postponed to 7:00 p.m. EST on Monday, February 27, making it the first Daytona 500 to be postponed to a Monday, as well as the first (and only) Daytona 500 to be run as a night race. Due to a two–hour red flag period after a jet dryer fire on the track with 40 laps remaining, the race did not end until about 12:40 a.m. on Tuesday, February 28. The 2013 race marked a return to the race's past tradition of ending in the late afternoon, as it ended at about 4:40 p.m., the race's earliest ending time since 2004. Although the 2014 race started around 1:30 p.m. EST, heavy rain and a tornado warning red–flagged the race after 38 laps and it was delayed for a record six hours and 22 minutes; the race finished the entire 500–mile distance around after 11:00 p.m. the same day, which effectively competed with the time-delayed East Coast broadcast of NBC's coverage of the 2014 Winter Olympics closing ceremony, scheduled between 7:00 and 10:30 p.m. The 2015 race started on time around 1:00  p.m., and ended after 203 laps due to a Green–white–checkered finish.