Once you drag the following link into your bookmarks, you can click on it to make Google reissue the current search, but limit the results to those updated in the past week. It will show google's date drop-down so you can opt to change it to the past [d]ay, [w]eek, [m]onth or [y]ear (or remove the date limiter).

If you prefer the default for gWhen to be another time period, just replace the "w" in the link below with the first letter of the period you prefer.

Source (protoscript.net)

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