/**
* Returns the week of the year for a date as a number between 0 and 53.
*
* The argument can be any expression as long as it resolves to a date.
*
* @see http://docs.mongodb.org/manual/reference/operator/aggregation/week/
* @see Expr::week
* @param mixed|Expr $expression
* @return self
*/
public function week($expression)
{
$this->expr->week($expression);
return $this;
}
