HTML5 meta http-equiv

I just learned that my favorite meta tags with http-equiv are obsolete in HTML5 doc types.
What should I be using to replace this tag?
<meta http-equiv="last-modified" content="05 March, 2013 19:00:00 gmt">
Nancy O.

A similar approach to the one in the recent cache prevention thread: in .htaccess
<IfModule mod_headers.c>
     <FilesMatch "\.(html|htm)$">
            Header Set Last-Modified "Tue, 05 March, 2013 19:00:00 GMT"
     </FilesMatch>
</IfModule>
Kenneth Kawamoto
http://www.materiaprima.co.uk/

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Hi there,
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The Website is here:
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''About the Bugzilla bug tracking system:'' If forum members can contribute to the development, please feel free to pitch in. Otherwise, it's generally not helpful to add comments to bugs (unless there is a call for test cases), but you can register on the Bugzilla site and "vote" for them to be fixed. See:
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Nag,
inside the body on load i use DIV Id = Map (i skipped that one line of code because it stops rest of the line from displaying in the thread)please surround your code with [ c o d e ] [ / c o d e ] (without the spaces).
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we are implementing a custom WPC web form along following SAP documentation:
http://scn.sap.com/docs/DOC-22253
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greetings
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Hello,
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