How to set a mechanical watch

Setting a mechanical watch looks simple — pull the crown, turn it — but a couple of small habits make the difference between a watch that's right to the second and one that ends up at the repairer with a damaged date wheel. Here's how to set time, date and GMT properly.

Know your crown positions

The crown connects to a stem inside the movement, and each "click" as you pull it out changes what turning it does:

A watch without a date usually has just two positions: wind and set. If you have a screw-down crown, unscrew it first (turn it towards you until it pops out), and remember to screw it back down afterwards — the water resistance depends on it.

Step 1: Wind it first

If the watch has stopped, wind it before setting it. A stopped watch that's set and then wound can lose a few seconds as it starts up. For hand-wound watches, wind until you feel resistance; for automatics, 20–40 turns. See how to wind a mechanical watch.

Step 2: Set the date — safely

This is the step where watches get damaged, so it comes before setting the time.

Most mechanical date wheels don't jump instantly at midnight. The date mechanism starts engaging a few hours before — usually from about 9 pm to 3 am — as a finger slowly pushes the date wheel. If you use the quick-set date while that finger is engaged, you can bend or break a tooth. This window is often called the date danger zone.

The safe way:

1. Pull the crown to position 2 (time setting).
2. Move the hands to around 6:30 — well clear of the danger zone.
3. Push the crown to position 1 and quick-set the date to yesterday's date.
4. Pull back to position 2 and move the hands forward through midnight. The date will click over to today.
5. Carry on to the correct time. Now you know AM from PM.

That last point matters: a date that changes at noon means the watch is 12 hours out. Going forward through midnight fixes that.

Day-date watches work the same way, but the day often has its own quick-set direction. Check the manual. Not every movement has a danger zone — some modern ones are protected — but following the routine never hurts.

Step 3: Set the time — to the second

Most modern mechanical watches have hacking seconds: when you pull the crown to the time-setting position, the balance wheel stops and the seconds hand freezes. That lets you synchronise the watch exactly.

1. Pull the crown to position 2 when the seconds hand reaches 12. It stops there.
2. Move the minute hand a minute or two past the correct time, then bring it back to exactly the right minute. Approaching from behind takes up the slack in the gears, so the minute hand lines up precisely with the marker.
3. Watch a reliable time source — your phone's clock or an atomic time website — and push the crown in exactly when it hits :00.

If your watch doesn't hack (many vintage and some affordable movements don't), you can still get close: set the minutes, then push the crown in when the seconds hand and the reference clock align. Some owners gently stop a non-hacking seconds hand by setting the minute hand backward — a trick that works on some movements but not others, so only try it if you know yours.

Step 4: Set the GMT hand

A GMT watch has an extra hand that goes around once every 24 hours, showing a second time zone. Setting depends on the movement type:

• "Traveller" GMT — the main hour hand jumps independently in one-hour steps (usually in crown position 1). You set the GMT hand to home time with the main hands, then jump the hour hand to local time when you travel.
• "Office" or "caller" GMT — the GMT hand is the one that jumps independently. You set the main hands to local time and jump the GMT hand to a second zone.

Either way, the 24-hour hand points to the 24-hour scale on the bezel or dial, so you can tell day from night in the other zone.

Step 5: Push in and check

Push the crown back to position 0 and, if it's a screw-down crown, screw it in firmly by turning it away from you while pressing gently. Check the seconds hand is running. Done.

Common mistakes

• Quick-setting the date between 9 pm and 3 am.
• Setting the hands backwards across midnight on some movements — many handle it, but forward is always safer.
• Leaving a screw-down crown unscrewed.
• Setting it 12 hours out — the date changes at noon. Go forward through midnight to fix it.
• Setting on the wrist — sideways pressure on the stem.

Set your watch in Mecha Watch

In Mecha Watch you set the time the same way you would on a real watch. Long-press the crown to pull it out; the seconds hand stops, just like hacking seconds; then drag around the dial to move the hands.

Most of the time you won't need to: when a stopped watch is wound back to life, its hands sweep to the correct time. Turn on Purist mode, though, and the app behaves like the real thing — after running down and restarting, your watch shows the wrong time until you pull the crown and set it yourself. If you've added a GMT complication, its 24-hour hand shows UTC.

Mecha Watch sounds like "make a watch". Purist mode is how you make one feel real.

Frequently asked questions

What time should you not change the date on a watch?

Avoid the quick-set date between roughly 9 pm and 3 am. On many movements the date-change mechanism is engaged then, and forcing the date can damage it.

What are hacking seconds?

A feature that stops the seconds hand when you pull the crown out to set the time, so you can synchronise the watch to the exact second.

Can you turn a mechanical watch's hands backwards?

Many modern movements tolerate it, but moving the hands forward is always the safer habit, especially near midnight on a date watch.

Why does my watch date change at noon?

The watch is set 12 hours out. Pull the crown to time-setting position and advance the hands 12 hours.

How do I set the date on an automatic watch?

Move the hands to about 6:30, pull the crown to the first position, quick-set to yesterday's date, then advance the hands through midnight and on to the correct time.