public Session withStartTimestamp(String startTimestamp) {
        setStartTimestamp(startTimestamp);
        return this;
    }
<p>
The date and time when the session began.
</p>

@param startTimestamp
       The date and time when the session began.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-pinpoint/src/main/java/com/amazonaws/services/pinpoint/model/Session.java