How To Set An Automatic Watch

The one rule: avoid the date-change window

Between roughly 9pm and 3am, the movement's date mechanism is engaged — the gears that will flip the date at midnight are already meshed and under tension. Forcing the date forward with the crown during this window can damage those teeth.

The fix is simple. Before setting the date, set the timeto somewhere in the middle of the day — around 6 o'clock is a safe habit — then set the date, then set the correct time. Some modern movements are protected against this and some aren't; treating every watch as if it isn't costs you nothing.

The full sequence

1. Unscrew the crown, if it screws down. On dive watches — the Turtle, Mako, most 200m watches — the crown is threaded shut. Turn it counter-clockwise until it springs free. Never pull a crown that hasn't been unscrewed.
2. Wind it.With the crown pushed in against the case, turn it clockwise 20–30 times. On most automatics you cannot overwind — a slipping clutch protects the mainspring — but stop when you feel resistance rather than forcing it. If the movement doesn't hand-wind at all (Seiko's 7S26 in the SNK809), skip this and shake the watch gently for about thirty seconds instead.
3. Pull the crown to the first click and set the date. Make sure the hands are showing mid-afternoon first. Advance the date to yesterday'sdate, not today's.
4. Pull the crown to the second click and set the time. Turn the hands forward past midnight — the date will roll over to today — and continue to the correct time. If your watch hacks, the seconds hand stops here, so you can release the crown on a time signal for a precise set.
5. Push the crown in, and screw it down if applicable. Press gently inward while turning clockwise until it seats. This is the step people forget, and an unscrewed crown is the most common cause of water getting into a case — see the water-resistance guide.

AM or PM: how to tell

Because the hands go round twice a day, an automatic has no inherent way of knowing morning from evening. Use the date. Wind the hands forward and watch for the date to flip — that moment is midnight. From there, keep going forward to your actual time. If you land on 3 o'clock and the date hasn't changed since you passed midnight once, it's 3am; go round again for 3pm.

Setting a GMT hand

On a caller GMT such as the Seiko 5 Sports SSK025, the 24-hour hand is set from the first crown position alongside the date. Set the 24-hour hand to your home zone, then set the main hands to local time in the second position. Note that a caller GMT does not let you jump the local hour hand independently — changing your own time zone means resetting the whole watch.

Things not to do

• Don't set the date between 9pm and 3am. Wind the hands to mid-afternoon first.
• Don't force a screw-down crown.If it isn't threading smoothly, back it off and start again — cross-threading a crown is expensive.
• Don't set the time backwards past midnight if you can avoid it. Going forward is always safe; going backwards through the date change puts the mechanism under load in the wrong direction.
• Don't operate the crown underwater — at any water-resistance rating.
• Don't leave the crown out. An unscrewed or partly pulled crown is an open case.

After a watch has been sitting

A stopped automatic isn't broken; it has simply run down. That's what a power reserve is. Wind it 20–30 turns, set it as above, and wear it — a day on the wrist tops the mainspring up fully. If it stops again within a few hours of a full wind, that's worth investigating: the troubleshooting guide covers what a genuine fault looks like.

And no, you still don't need a winder for this — we explain why at length. Thirty seconds a week is not a problem worth solving with a motor.