add time in time zone

data_for_time_zone.rb

Activity.all.each do |activity|
  begin
    puts activity.id
    if (tz=activity.get_value_from_info('timezone'))
      if Time.find_zone(tz)
        activity.activity_time_with_zone = DateTime.strptime(activity.activity_time.in_time_zone( tz ).strftime("%m/%d/%Y %H:%M:%S"), "%m/%d/%Y %H:%M:%S")
        activity.save!
      end
    end
  rescue Exception => e
    puts e
  end
end