6 Months period after filing I-485

[TexasGC485]

Hi,
 
As per AC140, one can change the job after 6 months from filing I-485 application. But I want know from what date we should count 6 months is it RD or ND.

TSC-485

 

[sklm_2002]

No Title

i think it is RD.

 

[jaxen]

AC21 - from RD for TSC