To review and sort invoice information at line level and more easily edit multiple invoices, use the Invoice Bulk Editor. Go to Customers (top tab) > cog symbol (top right) > Invoice Bulk Editor. 

This will enable you to sort by Line Item description, Issue Date, Invoice Number,  Customer name, Account name, or Amount of line item. Us the filters at the top to select a specific issue date range and/or set of accounts to include in the view. There is a separate view for Invoices and for Credit Notes. 

After sorting your invoice data. you can quickly change the start and end dates for multiple invoices at once.

See more options for changing the date in The system has not recognised dates correctly.  Why? How can I change them?