'A week' can mean different things to different fleets. Some fleets like to think of a week as Saturday to Friday, others as Saturday to Sunday.
The FleetOps platform can be configured to suit whatever is meaningful for your business. Typically, this is set as part of onboarding but it can be changed at any time by contacting support.
Note: that this is a fleet wide configuration and impacts all reporting.
To find how the week has been configured for your organization,
Set 'Last 1 Week' on any date selector
Open the calendar control to see the start and end day of your week