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When a post slug is changed, we store a copy of the old slug, so that we can redirect visitors visiting the old URL to the new URL. In the same way, this stores a copy of the old date, when the post date changes, so we can redirect visitors to the new URL. Props nickmomrik. Fixes #15397 for trunk. git-svn-id: https://develop.svn.wordpress.org/trunk@42401 602fd350-edb4-49c9-b593-d223f7449a82