how do i get the previous 3 months using the current month in javascript?

im creating an rss reader that lists the news feeds from the last 3 months. how do i get t开发者_StackOverflow中文版he feeds of the last 3 months relative to the current date? right now i have a list of all the feeds.

If the problem is that you can't access more than the ten items from the last two weeks of an RSS feed, then the problem is not on your side: most RSS feeds only offer the N most recent items from the source.