HTML Page Count Month

HTML Page Count Month

I'm trying to count all products sent in January

Working Code -  This just counts products sent on 01-01-2014
jan_prods_sent = Sales[(Prod_Sent_Date = "01-01-2014" && Prod_Status_ == "Product Sent")].count();

However I need a date range or a way to indicate a month to count the number of products sent in January.

Any ideas?
Thank you