Assistance on how to pass PERIOD as a parameter for Oracle Cloud ERP (custom) in Data Management

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We are using Oracle Cloud ERP (custom) to integrate Fusion Cloud ERP Fixed Assets, Cash Mgmt, AR and AP subledgers to ARCS, and have used $END_PERIODKEY[YYYY-MM-dd]$ as the period parameter for each of the report. The financial year for this client is Jul to Jun of the following year (example, FY21 is from July 2020 to Jun 2021 - period end Jul-21 to Jun-21). I am having issues with months July 2020 to December 2020. For example, the syntax is substituting December 2020 with the period close date (ie 2021-12-31), and is returning with the incorrect data. It seems like the fusion reports are driven by months (ie