June 30 is the 181st day of the year. There are 184 days remaining until the end of the year. This date is slightly more likely to fall on a Tuesday, Thursday or Saturday (58 in 400 years each) than on Sunday or Monday (57), and slightly less likely to occur on a Wednesday or Friday (56). It is the last day of the first half of the year.
+ 1937 – The world's first emergency telephone number, 999, is introduced in London.
+ 1953 – The first Chevrolet Corvette rolls off the assembly line in Flint, Michigan.
+ 1956 – A TWA Super Constellation and a United Airlines DC-7 collide above the Grand Canyon in Arizona and crash, killing all 128 on board both airliners.
+ 1985 – Thirty-nine American hostages from the hijacked TWA Flight 847 are freed in Beirut after being held for 17 days.
( Births )
+ 1919 – Ed Yost, American inventor of the modern hot air balloon (d. 2007)
+ 1966 – Mike Tyson, American boxer and actor
+ 1985 – Michael Phelps, American swimmer