April 18 is the 108th day of the year. There are 257 days remaining until the end of the year. This date is slightly more likely to fall on a Monday, Wednesday or Saturday (58 in 400 years each) than on Thursday or Friday (57), and slightly less likely to occur on a Tuesday or Sunday (56).
+ 1506 – The cornerstone of the current St. Peter's Basilica is laid.
+ 1775 – American Revolution: The British advancement by sea begins; Paul Revere and other riders warn the countryside of the troop movements.
+ 1906 – An earthquake and fire destroy much of San Francisco, California.
+ 1923 – Yankee Stadium: "The House that Ruth Built" opens.
+ 1947 – James Woods, American actor and producer
+ 1962 – Jeff Dunham, American comedian and ventriloquist