Citizen Men's Eco-Drive Blue Angels World Chronograph Atomic Timekeeping Watch with Day/Date, AT8020-03L Imported Stainless steel watch with slide-rule bezel featuring blue dial with chronograph functions and date window at three o'clock 43 millimeters stainless steel case with antireflective-sapphire dial window Japanese quartz movement with analog display.All Reset:When the watch does not work properly, you can reset all the settings. If the power reserve is insufficient, charge the watch first. Leather-synthetic band with buckle closure Water resistant to 660.0 feet Kindly refer the troubleshooting video for changing the date and time.