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Filtering OPML file by date of last post on each feed and outputting another OPML file based on results

I have a large OPML file acting as an archive for an online community. I'd like to generate further OPML files based on filtering the feeds it contains by the date last posted.

OPML Archive > script > OPML file of feeds which have posted within the last two months.

I need to leave the original OPML file intact for archival purposes.

I'd also like to update the OPML archive with new feeds added to a google reader bundle OPML

I'm currently having to di this manually and its a drag.

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