Timeline Slicers is a new feature in Excel 2013. Timeline Slicers enable you to analyze data based on time periods. For example you might want to view sales figures for a 5-day period. Timeline Slicers make it simple for you to do this.
Last month we looked at the Preview version of Microsoft Office 2013 in a two part webinar. The video below is a recording of the Timeline Slicers section of the webinar.