In 1997, the domain name for Google was registered on September 15. With over $1 million raised by investors, they were incorporated in 1998. On September 7, they set up shop in California; the date becoming Google Commemoration Day.

Well, September 7 is the day Google has claimed as its birthday since 1998, although it’s unclear exactly what was supposed to have happened on that date (it reportedly “ opened its door,” whatever that means), since the research project that became the Google search engine was started in 1996, the google.com domain was registered on September 15, 1997, and the company was incorporated on September 4, 1998 (by which date the search engine had already been online for some time).