We do not see a "Week Ending" Date Earned field/Granularity in the GIA OOTB HCM Payroll Balances or Payroll Costing subject areas.
Some of the requests Payroll receives need to be broken down by week date and as it stands right now that is not available, only pay period end date. The date earned we are looking for is the actual week ending date, which is different than the pay period begin/end dates or check date.