question: returns the valid from date of this cashier . the valid from/to dates may be used to define a time period in which the cashier is assignable to a teller . concode_field_sep String officeName concode_elem_sep String tellerName concode_elem_sep Collection<StaffData> staffOptions concode_elem_sep Date endDate concode_elem_sep String description concode_elem_sep Long tellerId concode_elem_sep Boolean isFullDay concode_elem_sep Long officeId concode_elem_sep String staffName concode_elem_sep String startTime concode_elem_sep Long id concode_elem_sep String endTime concode_elem_sep Long staffId concode_elem_sep Date startDate concode_field_sep CashierData template concode_elem_sep CashierData instance concode_elem_sep Long getId concode_elem_sep Date getEndDate concode_elem_sep Long getTellerId concode_elem_sep String getDescription concode_elem_sep Long getOfficeId concode_elem_sep String getEndTime concode_elem_sep String getTellerName concode_elem_sep Boolean isFullDay concode_elem_sep String getStaffName concode_elem_sep Long getStaffId concode_elem_sep String getOfficeName concode_elem_sep String getStartTime
target: Date function ( ) { return startDate ; }