if else for more than one date result

How do you use an if else to see if there is more than one date result?

<If condition={adv_event.dates > 0 }>
  <Then>
    <p>More than one</p>
  </Then>
  <Else>
    {adv_event.dates.length > 0 ? (
      <div className="col-md-4">
        {adv_event.dates &&
          <DateField props={adv_event.dates} />
        }
      </div>
    ) : ''}
  </Else>
</If>