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Have you ever wondered how the date function on your mechanical watch works? Well, on mechanical watches, the date function is tied directly to the mechanical wheels that drive the time function. Basically, the days of the month are listed on a circular ring underneath the watch dial that rotates mechanically, in conjunction with the hands on your watch, and fully changes days every 24 hours.

This watch part is referred to as the date ring and is designed to be rotated by a date change wheel. When selecting your watch’s date ring, you’ll want to select a date ring that’s designed for either a 3 o’clock window or a 6 o’clock window.

Not all watches are designed to tell the date. In fact, most are not. To show the date, not only do you need a date ring and a date change wheel, but also a watch dial that has a date window.

So just remember, if you are repairing a mechanical watch that has a date function, you’ll need to concentrate on three main things. The date ring, the date change wheel, and the watch dial’s date window.