```ruby
module CommaHeaven
  module ActiveRecord
    module ClassMethods
      def self.extended(base)
        base.class_eval do
          base.class_inheritable_accessor :comma_heaven_columns
          base.comma_heaven_columns = []
          
          base.class_inheritable_accessor :comma_heaven_associations
          base.comma_heaven_associations = []
        end
      end
      
      def to_comma_heaven(options = {})
        options.symbolize_keys!
        options[:limit] = options[:limit].to_i if options[:limit].kind_of?(String)
        options[:converter] ||= lambda { |v| v }
        
        FasterCSV::Table.new([]).tap do |table|
          columns = CommaHeaven::Sqler::Columns.new(self, options[:export])
          headers = columns.sql_as
          
          find(:all, :limit => options[:limit], :joins => columns.joins, :select => columns.select).each do |resource|
            fields = columns.sql_as.inject([]) do |acc, field|
              value = resource.send(field)
              
              if options[:format]
                value = value.to_time.strftime(options[:format][:datetime]) if value =~ %r{(\d+)-(\d+)-(\d+) (\d+):(\d+):(\d+)} && options[:format][:datetime]
              end
              
              acc << options[:converter].call(value)
            end
            
            table << FasterCSV::Row.new(headers, fields)
          end
        end
      end
    end
  end
end```

Support improved for date fields
user
```ruby
module CommaHeaven
  module ActiveRecord
    module ClassMethods
      def self.extended(base)
        base.class_eval do
          base.class_inheritable_accessor :comma_heaven_columns
          base.comma_heaven_columns = []
          
          base.class_inheritable_accessor :comma_heaven_associations
          base.comma_heaven_associations = []
        end
      end
      
      def to_comma_heaven(options = {})
        options.symbolize_keys!
        options[:limit] = options[:limit].to_i if options[:limit].kind_of?(String)
        options[:converter] ||= lambda { |v| v }
        
        FasterCSV::Table.new([]).tap do |table|
          columns = CommaHeaven::Sqler::Columns.new(self, options[:export])
          headers = columns.sql_as
          
          find(:all, :limit => options[:limit], :joins => columns.joins, :select => columns.select).each do |resource|
            fields = columns.sql_as.inject([]) do |acc, field|
              value = resource.send(field)
              
              if options[:format]
                value = value.to_time.strftime(options[:format][:datetime]) if value =~ %r{(\d+)-(\d+)-(\d+)} && options[:format][:datetime]
              end
              
              acc << options[:converter].call(value)
            end
            
            table << FasterCSV::Row.new(headers, fields)
          end
        end
      end
    end
  end
end```
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