Send Receive Script

I am trying to run this script! I am not sure what i inputted incorrectly, possibly put the date format into the script wrong. At any rate what is the proper date format to use if i just need totals for 1 day for example 9/14/2014

http://gallery.technet.microsoft.com/scriptcenter/Count-sent-and-recceived-f9c66cf7

Thank you for any help you can provide.

Thanks

Jessica Cochran