Indicates which Business Day the transaction is considered to belong to. Weekends and public holidays are often rolled forward to the next working day but it can vary according to the institution. This is stored in the java internal time format.
Example value is 1585180800000 which represents the date 26/03/2020.
This is the simple java function. Splunk solution to covert Long Date to (YYYY)MMDD value
long julianDateTime = 1585180800000l;
DateFormat fmt1 = new SimpleDateFormat("yyyy-MM-dd");