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Hi Ritesh, I know this is something that's often asked for but isn't yet possible.  Your crawl date is set based on your campaign start date and can't be changed.

You have to update your blog, and when the Google Starts to Crawl regularly - no problem for you. But you should add the Timestamp in the post or article content. !

dont forget to submit  a new sitemap to google within GWT AFTER you finish your removals and other changes as suggested. that should also force google to act a bit faster than it would otherwise do in recognizing the changes. http://googlewebmastercentral.blogspot.com/2011/08/submit-urls-to-google-with-fetch-as.html