The Yom Kippur War began on what Gregorian date?

The Yom Kippur War began on October 6, 1973.

Egyptian and Syrian forces launched a coordinated surprise attack against Israel on that date, which fell on Yom Kippur, Judaism’s holiest day, and the tenth day of Ramadan. Egypt attacked across the Suez Canal into the Sinai Peninsula, while Syria attacked Israeli positions in the Golan Heights. The opening caught Israel off guard and initially produced major Arab gains.

The conflict is also called the 1973 Arab-Israeli War, the October War, or the Ramadan War. It followed the 1967 Six-Day War, after which Israel occupied the Sinai Peninsula and Golan Heights. Fighting continued until October 25, 1973, despite ceasefires arranged during the conflict. The war reshaped regional politics, contributed to the 1973 oil crisis, and helped create conditions for the later Egypt-Israel peace process and the 1978 Camp David Accords.