The date range is used in the report.  By default the date that is used is the Created at date.  Other date options include:

• Fulfilled at
• Paid at

By default the Start Date and End Date will be used for the range of the report.  You may also choose several pre-defined defaults such as:

• Today
• Yesterday
• This Week
• Last Week
• This Month
• Last Month
• This Quarter
• Last Quarter
• This Year
• Last Year