You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: form_helper.rb
    path of file: ./repos/ekylibre/app/helpers/backend
    
    the code of the file until where you have to start completion: # == License
# Ekylibre - Simple agricultural ERP
# Copyright (C) 2008-2015 Brice Texier
#
# This program is free software: you can redistribute it and/or modify
# it under the ter
    
    def datetime_field_tag(name, value = nil, html_options = {})
      html_options[:size] ||= 16
      html_options[:lang] ||= 'i18n.iso2'.t
      html_options[:type] = :datetime
      html_options[:name] = name
      html_options[:value] = value || params[name]
      tag(:input, html_options)
    end