Question about processing dates

[sundu2006]

I see on USCIS website that they are processing 10/15/2005. IS this for FP or for interview?

I am pasting below:

District Office Processing Dates for Hartford CT Posted March 10, 2006
Form Form Name Now Processing Cases with Receipt Notice Date of:

N-400 Application for Naturalization October 15, 2005

Thank you
Sundu