How can pass StartDate and EndDate of last month from SSIS to SQL

Hi All,

I have one ETL and i need to pass last months start date and End Date to Store procedure.

I will have a SQL job which will run on 1st week of every month, and on the basis of that, It should take the last months date range  to run my SP code.

I want to pass those dates in System.Object in for each loop for 9 store procedures (one by one- custom auditing in between) 

Please Guide.

Dilip Patil..