week() public method

The argument can be any expression as long as it resolves to a date.
See also: http://docs.mongodb.org/manual/reference/operator/aggregation/week/
public week ( mixed | self $expression )
$expression mixed | self
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 /**
  * 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;
 }