Each Seiko Perpetual Calendar watch is a masterpiece of advanced timekeeping. The calendar is pre-set at the factory and will automatically adjust for the length of every month, including February in leap years, up to February 28, 2100. To reduce the need to ever reset these watches, they are highly accurate, with a yearly gain or loss of less than 20 seconds. In those models that feature Dual Time and World Time Display, you can set the watch for a second time zone when you travel without disturbing the setting for your home time zone. Most of perpetual calendar watch are Kinetic and are part of either the Premier or the Arctura range of watches. The kinetic technology allows the freedom of never changing the watch batteries because it uses the energy of your hand to power itself. Once set, the calendar automatically adjusts for even and odd months including leap years up to Feb 2100. Even during suspended animation mode, the watch keeps counting and once "awaken" it will reset itself correctly.Â Seiko Perpetual watches are the ideal choice for dress watches. They look great and the functionality and technology is top-notch! Why not get one of those!