If your administrator has configured PSA to generate billing events based on project specific time periods, you can select a cut-off date instead of a time period on which to base project and account billing events. Billing events are generated for time periods that end on or before the date you specify. The diagram that follows shows how PSA selects the time period type.
You can also schedule the generation of billing events based on project specific time periods. When you do this, you can choose an offset so that billing generation applies to a date other than the day on which billing generation is scheduled for.