: Represents the start date in YYMMDD format (June 8, 2021). 210615 : Represents the end date (June 15, 2021).
"Compressed archive containing [Project Name/Data Type] records for the period of June 8, 2021, through June 15, 2021." File: DoubleP_210608-210615.zip ...
This filename appears to be an archive of project or transaction data spanning from June 8, 2021, to June 15, 2021. : Represents the start date in YYMMDD format (June 8, 2021)