From which date I am entitled for MACPS

I worked in MCD (Municipal Corporation Of Delhi) as assistant teacher from 2-12-1983 to 27-01-1993. Thereafter, I was appointed as TGT on 28-01-1993 in Directorate of Education through SSC. My present pay scale and grade pay is 9300-34800 (GP 4800, PB2). I was granted ACP1 wef 28-01-2005. As per guidelines of the department, past services rendered in MCD shall be counted towards regular services for MACPS. Please let me know the date from which I shall be entitled for grant of MACP.
M.M. Gupta