Return a string "<a ..." for a trip at a random time.

def LatLngsToGoogleLink(source, destination):
  """Return a string "<a ..." for a trip at a random time."""
  dt = GetRandomDatetime()
  return "<a href='%s'>from:%s to:%s on %s</a>" % (
      LatLngsToGoogleUrl(source, destination, dt),
      FormatLatLng(source), FormatLatLng(destination),
      dt.ctime())