public TransitionState withLastChangedAt(java.util.Date lastChangedAt) {
        setLastChangedAt(lastChangedAt);
        return this;
    }
<p>
The timestamp when the transition state was last changed.
</p>

@param lastChangedAt
       The timestamp when the transition state was last changed.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-codepipeline/src/main/java/com/amazonaws/services/codepipeline/model/TransitionState.java