public SpotInstanceRequest withValidFrom(java.util.Date validFrom) {
        setValidFrom(validFrom);
        return this;
    }
<p>
The start date of the request, in UTC format (for example,
<i>YYYY</i>-<i>MM</i>-<i>DD</i>T<i>HH</i>:<i>MM</i>:<i>SS</i>Z). The request becomes active at this date and
time.
</p>

@param validFrom
       The start date of the request, in UTC format (for example,
       <i>YYYY</i>-<i>MM</i>-<i>DD</i>T<i>HH</i>:<i>MM</i>:<i>SS</i>Z). The request becomes active at this date
       and time.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/SpotInstanceRequest.java