public String toString() {
        return value;
    }
The date partitioning source for S3 Server Access Logging. This field can be specified in
{@link com.amazonaws.services.s3.model.PartitionedPrefix} If EventTime is specified, the log file prefix will be
based on the timestamp of the S3 event. If DeliveryTime is specified, the log file prefix will be based on the time
when the log file was delivered to S3. The default setting is EventTime.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/PartitionDateSource.java