public ImageSetsMetadataSummary withCreatedAt(java.util.Date createdAt) {
        setCreatedAt(createdAt);
        return this;
    }
<p>
The time an image set is created. Sample creation date is provided in <code>1985-04-12T23:20:50.52Z</code>
format.
</p>

@param createdAt
       The time an image set is created. Sample creation date is provided in <code>1985-04-12T23:20:50.52Z</code>
       format.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-medicalimaging/src/main/java/com/amazonaws/services/medicalimaging/model/ImageSetsMetadataSummary.java