After the first two years where the Diamondbacks changed the game start times from 7:05 PM to 6:40 PM depending on the month, they had finally settled on all week-day games starting at 6:40 PM. This worked and made the games much more family friendly since you could go to a game and still get home at a decent time to put the kids to bed. The other nicety about the standard start time is that you always know when the game is. If a game starts at 6:40 PM then the gates at Chase Field open at 4:40 PM meaning I need to leave the house at 4:00 PM to get there on time. This helps as I know which freeways and roads I should avoid right before rush hour to downtown Phoenix. So when a game doesn’t follow the standard timeline, it really throws a monkey wrench into things.