^I had to fact-check that one. "World Without Love" came out in the US late Feb. 64; the info I found regarding "Bad to Me" is contradictory--may have been released in the US in Sept. '63 (so was "She Loves You", but nobody this side of the pond had heard of it yet), or sometime in '64.
More #1 singles from famous (some infamous) dates in history....
April 4, 1968:
[yt]http://www.youtube.com/watch?v=rTVjnBo96Ug[/yt]
June 5, 1968
[yt]http://www.youtube.com/watch?v=9C1BCAgu2I8[/yt]
July 20, 1969:
[yt]http://www.youtube.com/watch?v=zUQFFO2ZQ-o[/yt]
The above was still the #1 single on August 15 and 16, but by August 17 and 18, it had a successor:
[yt]http://www.youtube.com/watch?v=UzNxYjf_4p4[/yt]