even if BBC Sherlock acts rather like 15,9 often 

Long live Sherlock Holmes........I  know you'll be here in new incarnations to enthrall many generations to come.........You are simply immortal

Happy birthday, dear Mr. Sherlock Holmes! The world's most (and only) beloved consulting detective!

Boss, you are late to your own birthday. 

http://sherlock.boardhost.com/viewtopic.php?id=2494

Today is also the birthday of one of my good friends.  Is there a reason in canon for January 6th as Sherlock's birthday?  (Sorry if I missed this on another thread).  I'd like to tell her about it when I call her later tonight.

OK...this is off Wiki:

An estimate of Holmes's age in the story "His Last Bow" places his birth in 1854; the story is set in August 1914 and he is described as being 60 years of age. Leslie Klinger cites the date as 6 January.

And then later on in the same article:

The fifty-six short stories and four novels written by Conan Doyle are termed the "canon" by Sherlock Holmes fans. Early scholars of the canon included Ronald Knox[41] in Britain and Christopher Morley in New York,[42] the latter having founded the Baker Street Irregulars, the first society devoted exclusively to the canon of Holmes, in 1934.[43]
According to Morley, Holmes's birthday was January 6, 1854.[44][45]
Author Laurie R. King has speculated about Holmes's birth date, based on two of Conan Doyle's stories: A Study in Scarlet and "The Gloria Scott" Adventure. Certain details in "The Gloria Scott" Adventure indicate Holmes finished his second and final year at university in either 1880 or 1885. Watson's own account of his wounding in the Second Afghan War and subsequent return to England in A Study in Scarlet place his moving in with Holmes in either early 1881 or 1882. Together, these suggest Holmes left university in 1880; if he began university at the age of 17, his birth year would likely be 1861.[46]