found this in the UserGuide - pg 446 - 447
The following table lists and explains the property settings of the BASServer.props file that are used to initialize the Aware IM Server:
PublicHolidays - A collection of days identifying public holidays in the country or state of operation. This information is used by BUSINESS_DAY_FORWARD and BUSINESS_DAY_BACK functions of the Rule Language (see “Aware IM Rule Language Reference”). The days must be in the format “dd/MM/yyyy” and must be separated by comma, for example:
25/12/2004,26/12/2004,… If this propery is not specified BUSINESS_DAY_FORWARD and BUSINESS_DAY_BACK functions will only consider weekends as non-working days.