This is the employment requirement for your NOC.
Employment requirements
A bachelor's degree in business administration, economics, commerce or a related field is required.
A master's degree in business administration (concentration in finance), or another master's level management program may be required.
Several years of experience in accounting, auditing, budgeting, financial planning and analysis or other financial activities are required.
Accounting and audit managers may require a recognized accounting designation (CA, CMA or CGA).
Here's the link :
http://www5.hrsdc.gc.ca/NOC/English/NOC/2011/QuickSearch.aspx?val65=0111
So, IMO, you can count work experience from the day you graduated.