Apple made sweeping changes in iOS 7 and left few stones unturned in the core system apps that ship in the OS. Another app that saw some profound changes is the Calendar app, which was the recipeint of a significant visual overhaul.
UI
Gone is the planner-style look in the iOS 6 version of the Calendar. Replacing it is a bleached white UI that is accented only by the black text, red navigation elements and color markers highlighting important dates. Though striking, it is minimalist to the max and my be jarring to users expecting the color splash that graces the iOS7 homescreen. The layout is easy to figure out with the calendar in the middle and controls at the top and bottom. The top controls allow you to switch from a day view, month view and year view. There's also a search button and a "+"
