Adding date field to each individual Items when creating Invoices?

Adding date field to each individual Items when creating Invoices?

When adding items into an invoice I need to be able to have a date for each item.

Example below:

   Date                Item                  Description         Qty           Rate         Discount(%)      Tax          Amount 
31/07/13       Brown Sugar           Performance       1.00         3,000.00         0.00                 10%          $3300


Is this possible or will it be in the near future?

Thanks
Deni