public DateInterval withStartDateTime(String startDateTime) {
        setStartDateTime(startDateTime);
        return this;
    }
<p>
A JSON object containing start and date time (UTC). Date and time format is RFC 3339 :
'yyyy-MM-dd'T'HH:mm:ss.SSSZZ'.
</p>

@param startDateTime
       A JSON object containing start and date time (UTC). Date and time format is RFC 3339 :
       'yyyy-MM-dd'T'HH:mm:ss.SSSZZ'.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-support/src/main/java/com/amazonaws/services/support/model/DateInterval.java