definitionExpression

An expression (SQL where clause) to filter features queried in this table. The definition expression string uses the SQL-92 where clause syntax (https://en.wikipedia.org/wiki/SQL-92). Be sure to escape special characters in the expression string as required for your platform. The DATE keyword expects the date format yyyy-mm-dd and the TIMESTAMP keyword expects the time stamp format yyyy-mm-dd hh:mm:ss. For more information, see the ArcGIS Blog article https://www.esri.com/arcgis-blog/products/api-rest/data-management/querying-feature-services-date-time-queries/.