Any luck yet Oz? I'm having the same problem. I've grown accustomed to narrowing down my searches by using the time frames (within 24 hours, week, month etc.). Unable to locate that option on IE10 and Bing Search. Also downloaded the Google app but no luck there either. Was hoping that maybe there were shortcuts to help filter search results by time eg. Best WP8 News apps live tiles, "past week".
If anything, I'm fairly confident we will see this issue addressed in an update in the near future.