How to adjust the day and date on a watch

The basic methods for adjusting a watch and important precautions are as follows:

1. The day and date must not be adjusted between 21 p.m. and 3 a.m., as this can cause severe damage to the watch. The date changes via gear drive and therefore typically moves slowly.

2. The day indicator updates automatically. Both the date and day change at midnight—a level of precision found only in quartz watches, whereas mechanical watches are not quite as precise. The change may happen slightly early or late because both the date and day are driven by a wheel ring; attempting to change both simultaneously would require a huge amount of driving force.   Therefore, they change separately, with the day indicator generally shifting anywhere from half an hour to a few hours after the date changes.

3. Solution if the watch date changes at 11 o'clock, 12 o'clock, or 1 o'clock in the afternoon: simply advance the hour hand clockwise by a full twenty-four hours and then readjust the date.

4. The middle crown has two positions: the first position is for adjusting the date, and the second position is for setting the time. When in the first position, rotating it backwards adjusts the date (if the watch does not feature a day display, the day setting is unnecessary), while rotating it forwards adjusts the day.