This Date Span icon is made in Material Design style developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 4,400 icons, all in the same style and quality.
There are two rectangles. In the bottom rectangle, there is a double-sided arrow. The arrow is in the center of the bottom rectangle. The top rectangle is connected to the bottom rectangle. There are two square on top of the top rectangle. They are to the center left and center right of the top rectangle.