The first World Series night game was Game Four of the 1971 series at Three Rivers Stadium, a 4-3 victory for the Pirates over the Orioles. I checked Retrosheet to learn how quickly things transitioned to an all-night-game series. I went by the “day/night” flag in the info section.
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By 1974 more than half the games were being played at night. For the next decade, about a third of the games were still played during the day. The 1985 series between the Cardinals and Twins was the first series without a day game. A day game was played in 1987 at 4pm local time on a Saturday afternoon in Minnesota. Of course, since it was played under the dome, there was no direct sunlight.
The graph shows day games played in 2010. That happened because the Giants were hosting games in the Pacific Time Zone. In order to hit the magic 8pm Eastern Time spot, those games started at 4:57pm and 4:59pm local time, according to Baseball Reference. Retrosheet’s day/night discriminator is apparently 5pm, so those games count as day games. The local sunset was around 6:18pm, which means about an hour and 20 minutes in the daytime. Those start times still look a little strange to me. I thought the 8pm start times dictated first pitches at about seven minutes past the hour. That’s what happened in 2012 when the starts were 5:08 & 5:09 Pacific Time, again in San Francisco.
However you classify these “twilight” games, it’s safe to say that we won’t see a real World Series day game for a long time, if ever. Too bad.