Yom Kippur falls each year on the tenth day of the Jewish month of Tishrei, which is nine days after the first day of Rosh Hashanah. In terms of the Gregorian calendar, the earliest date on which Yom Kippur can fall is September 14, as happened most recently in 1899 and 2013. The latest Yom Kippur can occur relative to the Gregorian dates is on October 14, as happened in 1967 and will happen again in 2043. After 2089, the differences between the Hebrew calendar and the Gregorian calendar will result in Yom Kippur falling no earlier than September 15. Gregorian calendar dates for recent and upcoming Yom Kippur holidays are:
Hall of Fame first baseman Hank Greenberg attracted national attention in 1934, when he refused to play baseball on Yom Kippur, even though the Tigers were in the middle of a pennant race, and he was leading the league in runs batted in. The Detroit Free Press columnist and poet Edgar A. Guest wrote a poem titled "Speaking of Greenberg", which ended with the lines "We shall miss him on the infield and shall miss him at the bat / But he's true to his religion—and I honor him for that." When Greenberg arrived in synagogue on Yom Kippur, the service stopped suddenly, and the congregation gave an embarrassed Greenberg a standing ovation.
In 1973, an air raid siren was sounded on the afternoon of Yom Kippur and radio broadcasts were resumed to alert the public to the surprise attack on Israel by Egypt and Syria that launched the Yom Kippur War.
Los Angeles Dodgers outfielder Shawn Green, similarly, made headlines in 2001 for sitting out a game for the first time in 415 games (then the longest streak among active players) on Yom Kippur, even though his team was in the middle of a playoff race. Other baseball players who have similarly sat out games on Yom Kippur include Kevin Youkilis, Brad Ausmus, and Art Shamsky.
Gabe Carimi, the Consensus All-American left tackle in American football who won the 2010 Outland Trophy as the nation's top collegiate interior lineman, faced a conflict in his freshman year of college in 2007. That year Yom Kippur fell on a Saturday, and he fasted until an hour before his football game against Iowa started that night. Carimi said, "Religion is a part of me, and I don't want to just say I'm Jewish. I actually do make sacrifices that I know are hard choices." In 2004, Matt Bernstein, standout fullback at University of Wisconsin–Madison, fasted on Yom Kippur, then broke his fast on the sidelines before rushing for 123 yards in a game against Penn State.
In 2011, golfer Laetitia Beck declined a request to join the University of North Carolina Tar Heels Invitational competition, because it conflicted with Yom Kippur. Instead, she spent the day fasting and praying. She said: "My Judaism is very important to me, and ... on Yom Kippur, no matter what, I have to fast." Boris Gelfand, Israel's top chess player, played his game in the prestigious London Grand Prix Chess Tournament on 25 September 2012 (eve of Yom Kippur) earlier, to avoid playing on the holiday.
In 2013, 73% of the Jewish people of Israel said that they were intending to fast on Yom Kippur. It is very common in Israel to wish "Tsom Kal" ([an] easy fast) or "Tsom Mo'il" ([a] benefiting fast) to everyone before Yom Kippur, even if one does not know whether they will fast or not.
In 2013, the International Tennis Federation fined the Israel Tennis Association "more than $13,000 ... for the inconvenience" of having to reschedule a tennis match between the Israeli and Belgian teams that was originally scheduled on Yom Kippur. Dudi Sela, Israel's #1 player, quit his quarterfinal match in the third set of the 2017 Shenzhen Open so he could begin observing Yom Kippur by the time the sun set, forfeiting a possible $34,000 in prize money and 90 rankings points.
Since 2016 the United Nations has officially recognized Yom Kippur, stating that from then on no official meetings would take place on the day. In addition, the United Nations stated that, beginning in 2016, they would have nine official holidays and seven floating holidays of which each employee would be able to choose one. It stated that the floating holidays will be Yom Kippur, Day of Vesak, Diwali, Gurpurab, Orthodox Christmas, Orthodox Good Friday, and Presidents' Day. This was the first time the United Nations officially recognized any Jewish holiday.