Google recently launched its own webrowser named Google Chrome, seems its a special thing from Google for all his lovers. Google itself celebrates his own birth day at any date in September month. It is observed that Google has no exact date to celebrate his birthday.
Take a look at the Google’s home page, when he was new born
According to Web archives Google 1st page was launched on Nov 11, 1998,. It was without logo (Atleast on main page)