http://resoapi.wfrmls.com/reso/odata/Properties?$filter=ModificationTimestamp le now() and (PropertyType has Odata.Models.PropertyType'Residential')&$select=ListingKeyNumeric,BedroomsTotal,Directions,ListingContractDate,ModificationTimestamp,StandardStatus,PropertyType,PublicRemarks,ModificationTimestamp&$top=10
The function now() will return the now time in UTC