Question

Rss parser problem with pubDate

Asked by: babuno5

I m trying to parse this RSS feed

http://www.rediff.com/rss/usrss.xml

I have written this code which is shown below

The problem i m facing is with the pubDate

The date that i get from the RSS is
<pubDate>Tue, 02 Dec 2008 06:07:07 GMT</pubDate>

And when is parse this RSS url with the RSS::Parser i get the value of pubDate in the logger as
Wed, 02 Jan 2008 11:37:07 +0530

Please suggest some solutions

Thanks

require 'rss/2.0'
require 'open-uri'
class NewsController < ApplicationController
  
 
  def index
	begin
	    if !$app_lang || $app_lang == 'en'
	      feed_url = 'http://www.rediff.com/rss/usrss.xml'
	    else
	      feed_url = 'http://localhost:8080/WebSummary/newssummary.jsp?cmbLanguage='+$app_lang
	    end
	    open(feed_url) do |http|
	      response = http.read
	      @result = RSS::Parser.parse(response, false)
	      logger.info @result.channel.pubDate
	    end
	rescue StandardError => myStandardError
		logger.info(myStandardError)
	end
  end
end

                                  
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Asked On
2008-12-01 at 22:11:40ID23948931
Tags

Ruby on Rails

Topics

RubyOnRails

,

Ruby Scripting Language

Participating Experts
1
Points
500
Comments
11

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Answers

 

by: doadesPosted on 2008-12-02 at 00:21:39ID: 23075183

You can use strftime?!

logger.info @result.channel.pubDate.strftime("%a, %d %b %Y, %H %M %S %Z")

You can move, add commas and : into the string and it shouldn't matter.

 

by: babuno5Posted on 2008-12-02 at 01:10:44ID: 23075364

Thanks for the reply
the problem is not of date time formatting but actually the date which i m getting after parsing from the RSS is wrong

The original date is
Tue, 02 Dec 2008

And then the modified date after parsing is
Wed, 02 Jan 2008

which is a a date some 11 months before
I dont know how this is getting manipulated

The output after parsing should be the same date as what comes in the RSS feed

 

by: doadesPosted on 2008-12-02 at 07:48:32ID: 23077906

So the date is getting changed when your script does the parse?

Have you checked you system time?

 

by: babuno5Posted on 2008-12-02 at 08:18:27ID: 23078275

yes the date is getting changed when the script parses it

The system date time is set to IST which is +5:30

 

by: doadesPosted on 2008-12-02 at 08:56:00ID: 23078618

It is very strange, I have copied your code and run it myself, and it seems to run fine.

Can you add

print Time.now

before and after you parse the feed, I know this seems pointless but it might show where and when it is going wrong

 

by: babuno5Posted on 2008-12-02 at 21:34:37ID: 23083473

here is the output which i printed in the logger

Before Parsing RSS
Wed Dec 03 11:03:21 +0530 2008


After Parsing RSS
Wed Dec 03 11:03:21 +0530 2008


Date from parsing RSS
Thu, 03 Jan 2008 10:57:01 +0530


  def index
	begin
	    if !$app_lang || $app_lang == 'en'
	      feed_url = 'http://www.rediff.com/rss/usrss.xml'
	    else
	      feed_url = 'http://localhost:8080/WebSummary/newssummary.jsp?cmbLanguage='+$app_lang
	    end
	    open(feed_url) do |http|
	      response = http.read
	        logger.info "Before Parsing RSS"
		logger.info Time.now
	      @result = RSS::Parser.parse(response, false)
	      logger.info "After Parsing RSS"
	      logger.info   Time.now
		logger.info "Date from parsing RSS"
	      logger.info @result.channel.pubDate
	    end
	rescue StandardError => myStandardError
		logger.info(myStandardError)
	end
  end

                                              
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by: doadesPosted on 2008-12-03 at 08:02:49ID: 23087230

It looks like there is nothing wrong with the code, but your rss feed!

It might sound stupid but have you check your rss pub dates etc.?

 

by: babuno5Posted on 2008-12-03 at 22:05:43ID: 23092898

Actually now i have tried myself the same code on my local machine and it is working fine  and it also work on your side so the problem with the code is out of question

May be the problem is with the server timezone setting

The setup for my remote server is

Server hosted in Amazon EC2
Rails 2.1.2
ruby 1.8.5 (2006-08-25) [i386-linux]
We have change the timezone of the server to Asia/Calcutta
We made changes according to this url
http://www.wikihow.com/Change-the-Timezone-in-Linux

 

by: doadesPosted on 2008-12-04 at 00:10:26ID: 23093359

Yes I think that your code is fine, well done :)

After changing the timezone, did it help?

I can still get them with the right date but of course 1hour behind.

 

by: babuno5Posted on 2008-12-04 at 00:49:49ID: 23093482

Actually the timezone was changed once the instance of EC2 was started.

We encountered the problem during development.

We also reverted the changes of timezone that we did but still that did not help

Well it is still an open question for me my next step is to may be sit with a system admin and have the system check up.

 

by: doadesPosted on 2008-12-04 at 13:41:25ID: 23099789

I think I would have to say that it is the site/server that is the problem and the actual rss pub date

20120131-EE-VQP-002

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