Adjusting an Automatic Watch

How to Set Your Mechanical Watch

(Miyota 8215 / NH35 Movements with Screw-Down Crown)
The following steps apply to watches equipped with the Miyota 8215 or NH35 automatic movement. Both movements use the same crown operation.

Important Notes

Do not set the date between 9:00 PM and 3:00 AM. Setting the date during this period may damage the date mechanism.
For safer operation, first move the hands to approximately 6:00 before adjusting the date.
Always screw the crown down fully after setting to maintain water resistance.

Step 1: Unlock the Crown

Gently press the crown inward and turn it counterclockwise. You will feel and hear a clear click/pop as the crown releases and unlocks from the case.

Step 2: Set the Date

Gently pull the crown outward to the first position (first stage). Turn the crown counterclockwise to advance the date to the correct day.

Step 3: Set the Time

Pull the crown outward further to the second position (second stage). Turn the crown to set the correct hour and minute.

Step 4: Push the Crown Back In

After setting is complete, push the crown inward through both stages until it returns to the normal (fully pushed-in) position.

Step 5: Lock the Crown

Press the crown inward and turn it clockwise until it is tightly screwed down and locked. This restores the water resistance of the watch.

Frequently Asked Questions

How do I unlock the crown?

Gently press the crown inward and turn it counterclockwise until it pops and releases.

Which position sets the date and which sets the time?

The first outward position sets the date. The second outward position sets the time.

Which way do I turn the crown to change the date?

Turn the crown counterclockwise while it is in the first position.

Can I set the date at any time of day?

No. Avoid setting the date between 9:00 PM and 3:00 AM. It is safer to first move the hands to around 6:00, then set the date.

What if I forget to lock the crown?

The watch may lose water resistance. Always press and turn the crown clockwise until it is fully screwed down after setting.

Do I need to wind the watch manually?

These are automatic movements. Normal daily wear will keep them wound. If the watch has stopped, unlock the crown, turn it clockwise about 20–30 times in the normal position, then lock it again.