Happy Independence Day to y'all over there. But wait... shock! horror! Wikipedia says:

Historians have long disputed whether Congress actually signed the Declaration of Independence on July 4, even though Thomas Jefferson, John Adams, and Benjamin Franklin all later wrote that they had signed it on that day. Most historians have concluded that the Declaration was signed nearly a month after its adoption, on August 2, 1776, and not on July 4 as is commonly believed.

Oh no! :-)