find how many store dont buy a product as required conditions

Hi friends,

I have 2tables Order( ORderdate, Product_ID, Quantity, Store_ID)

and table Store(Store_ID, StoreName)

I need to count how many store that didnt order Product"A" 2 consecutive days from the fist day of month up to today!.

I think that i need to use datebetween function to calculate the days between 2 order times of each store but i am unable to do that because a store can buy product"A" in different dates and i didnt know the startdate and enddate !...

Could anyone give me some advices on my issue?

Regards,
J.