The Bill Date selection criteria can be used to narrow down the time frame for which details will be included in the output. In this version of the Date Range control, you have the option of specifying:
Custom Date Range -- You can specify a specific From and To date by either typing in the dates directly or using the calendar control
Named Date Range -- You can specify a named date range from the list of available built-in values. This approach may be particularly helpful if you plan to save the criteria.
Note that if you have enabled the Allow Creation of and Show Fiscal Calendar Options (unanet.fiscal_calendar.enabled) property, additional 'fiscal' period options will be available in the drop-down.
Fiscal periods must be established via the Admin >> Setup >> Fiscal Year screen in order to be available for use in reporting. Specific Fiscal Periods appearing in drop-down lists will be a concatenation of Fiscal Year Name w/ Accounting Period.
When originally defining Fixed Price items, the Billing Manager will specify a "Bill Date" associated with each fixed price item. This is the date that is being referenced by this filter.