public Operation withStatusChangedAt(java.util.Date statusChangedAt) {
        setStatusChangedAt(statusChangedAt);
        return this;
    }
<p>
The timestamp when the status was changed (<code>1479816991.349</code>).
</p>

@param statusChangedAt
       The timestamp when the status was changed (<code>1479816991.349</code>).
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-lightsail/src/main/java/com/amazonaws/services/lightsail/model/Operation.java