GoogleOn the surface, these time filters appear to present searchers with little more than a look back at what was relevant in previous time periods. For example, you can filter the index for content added in the last few hours, day, week, month, year or even across a custom date range. It’s like time-traveling using the Wayback Machine, but for search results, right? Not exactly. In fact, not at all.

Read more about Google’s Time Dimension