This stylish chronograph watch guarantees youll never lose track of the time or day it has an extra large dual window that displays the date clearly while the inset dial points to the day of the week each watch is factory set to gmt london time and the perpetual calendar automatically monitors year month and day so you shouldnt ever have to adjust it even in a leap year you can also use the window display as a timer and stopwatch it will revert to the correct date when finished