public UtteranceSpecification withConversationStartTime(java.util.Date conversationStartTime) {
        setConversationStartTime(conversationStartTime);
        return this;
    }
<p>
The date and time when the conversation in which the utterance took place began. A conversation is defined as a
unique combination of a <code>sessionId</code> and an <code>originatingRequestId</code>.
</p>

@param conversationStartTime
       The date and time when the conversation in which the utterance took place began. A conversation is defined
       as a unique combination of a <code>sessionId</code> and an <code>originatingRequestId</code>.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-lexmodelsv2/src/main/java/com/amazonaws/services/lexmodelsv2/model/UtteranceSpecification.java