The "Publication date" filter or time-based filter allows you to filter your searches according to the articles' publication date or last update.
This filter, accessible from the filter bar on the top left corner of your screen, allows you to display information according to publication dates of the articles.
When hovering over the timeline with your cursor, you will be shown the amount of documents regarding the specific time lap you are consulting. You can then easily identify the periods in time that strongly addressed your topic. It is easy to make a focus on the period chosen, selecting it by drag and drop.
This filter and the "Date mentioned" filter is independent. It means that they will adapt themselves according to the setups you have selected for any filter.
To learn more about the filters' global use, have a look to the article: "The different filters available on Geotrend".