Which date to consider for I 485 - Receipt Date or Notice Date ?

[nisargmca]

Hello Everyone,

My employer has filed H1b Amendment + Extention in July 2018 and I have received RFE for the same .My current I-94 expired on Feb 28,2019 and I am on 240 day rule .I filed family based I - 485 on Feb 16,2019 and USCIS has send the receipt with receipt date as Feb 19,2019 and notice date as March 05 ,2019.

Here is the summary :
I-485 Filing Date - Feb 16,2019
I-485 Received by USCIS - Feb 19,2019
I-485 Notice Date - Mar 05,2019 
I- 94 Expiration Date - Feb 28,2019

Which date is considered for I 485 receipt date or notece date ?
If my H1b will get denied then will the period Feb 28 - March 05 will be considered as illegal stay ?

Thanks in Advance