Changing permalink structure

  • I am thinking to change my permalink structure to something different which can’t be described with regular expression, so I can’t use a plugin like “redirection” to set the thing up.
    I want to change it from:
    /%year%/%monthnum%/%postname%.html
    to
    /%hour%%minute%%second%/%postname%

    The thing is that on my newly installed blog with the same version of wordpress, if I change the permalink structure, and visit the old URL, it redirects to the new permalink automatically! I don’t know how it does it, but it works.
    However, with my old blog, it doesn’t work like that. I get a 404 page when I change the structure.
    Do anyone know why two different behaviours with two same version of wordpress and how I can fix the old blog to react like the new blog and redirect to the new permalink structure automatically?

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