Get rules start date and end date

Retrieve the start and end dates of rules.

if ( class_exists('\Wdr\App\Controllers\ManageDiscount')) {
		$rules = \Wdr\App\Controllers\ManageDiscount::$available_rules;
		$start_date = $end_date = array();
		if(!empty($rules) && is_array($rules)){
			foreach ($rules as $rule){
				if($rule->rule->enabled == 1){
					$rule_id = $rule->rule->id;
					//get timestamp
					$start_date_timestamp = $rule->rule->date_from;
					$end_date_timestamp = $rule->rule->date_to;
					//Date format
					$format = "Y-m-d H:i:s";
					$start_date[$rule_id] = date($format, $start_date_timestamp);
					$end_date[$rule_id] = date($format, $end_date_timestamp);
				}	
			}
		} 
	}