Does HTML5 have a localStorage expiration date?

Possible duplicate:
DOM expires

If I add some data to the local storage of the browser, does it expire, naturally? I'm going to store some data with local HTML 5 storage, but its nature means it will expire in a few weeks.

So, I am wondering if there is a way to check if a data update is needed? Or just update the data every few weeks.

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html5 local-storage
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