This text provides a comprehensive comparison between date and time functionalities in Oracle and Couchbase databases, focusing on their respective formats and precision capabilities. Oracle employs various data types like DATE and TIMESTAMP, with formats customizable through parameters like NLS_DATE_FORMAT, allowing flexibility with format literations and time zones. In contrast, Couchbase utilizes JSON strings adhering to the ISO 8601 format, offering a more standardized approach with functions for date-time manipulation in N1QL. While Oracle supports fractional second precision up to nine digits and includes extensive time zone components, Couchbase limits precision to three digits and uses Unix timestamps for time zone representation. Additionally, Oracle's flexibility in format manipulation contrasts with Couchbase's strict adherence to predefined formats, though Couchbase compensates with flexible JSON structures that require no strict schemas. The text highlights how these differences impact the handling and conversion of date-time data, offering insights into their respective strengths and limitations.