That is fancy 🙂 Date picker presented as sliding bar as shown on the picture:
This element enables you to pick dates with a simple slider bar. By dragging the bar over the time-line, the dates change instantly. Besides this, when the user decides to manually change the dates, the bar is automatically adjusted to the corresponding dates.
That is what the creators say, for me it looks cool just couple of things.. on IE throws and error when putting the end date before the start date. Then its kinda hard to hit a specific date from the first time. But overall its nifty.