Pythagorean values for the letters in his name are 255194.
2+5+5+1+9+4 = 26
He joined January '11, so that's (1+11)+26 = 38
1 post and 8 downloads, (1+8)+38 = 47
His post was made on 02/21, (2x21)x47 = 1974
1974/2, because his name has two syllables, that's 987
Now, let's take 987 and this date from next month, 321 (if you miss SPACE)
987 - 321 = 666
