Direct answer: Unscrew the crown, wind the movement if needed, then use the crown’s two pull positions: the first pull (position 2) lets you set the 12‑hour local hour hand in one‑hour jumps (quickset date via crossing midnight); the second pull (position 3) stops the seconds and sets the minutes and the 24‑hour GMT hand together. Use the bi‑directional 24‑hour bezel to read a second or third timezone. Always screw the crown back down to restore water resistance.

Detailed explanation

The Rolex GMT‑Master II is designed for travellers: it has an independent 12‑hour local hour hand, a 24‑hour hand (GMT hand) tied to the minute and seconds, and a rotatable 24‑hour bezel to read a third timezone. Follow these steps to set it correctly and safely.

  1. Unscrew the crown: Turn the crown counterclockwise until it pops free from the case. This releases the crown to the winding position. Keep the watch horizontal and dry while doing this.
  2. Wind the watch (optional but recommended): In the crown’s neutral pulled‑in state (position 1 when unscrewed), wind the crown about 20–40 turns clockwise to ensure the mainspring has adequate power reserve. Modern Rolex movements have a slipping clutch and won’t be damaged by reasonable winding, but 20–40 turns is normally sufficient.
  3. Set the local hour (quickset) — first click (position 2): Pull the crown out one click. In this position the 12‑hour hand moves in one‑hour increments independently of the GMT (24‑hour) hand and the minutes. Rotate the crown forwards or backwards to move the local hour to the correct local time. Each time the hour hand passes midnight, the date will advance (or reverse), so you can change date quickly by stepping the hour hand across midnight. Because the seconds and minutes continue to run, you won’t interrupt chronometric timing when changing local time.
  4. Set the minute and GMT (24‑hour) hand — second click (position 3): Pull the crown fully out. This stops the seconds (hacking) so you can set the time precisely. Rotate the crown to set the minutes and simultaneously position the 24‑hour GMT hand to the correct 24‑hour reading for your reference/home timezone. Ensure AM/PM is correct for the 24‑hour hand — remember the GMT hand follows 24‑hour scale, not 12‑hour.
  5. Use the bezel for a third timezone: With the GMT hand set to your home time (24‑hour), rotate the bi‑directional bezel so the GMT hand points to the hour of the second timezone on the 24‑hour scale. To read a third timezone, rotate the bezel an additional number of hours (clockwise or counterclockwise) and read the GMT hand against the bezel numerals.
  6. Return crown and secure: Push the crown back in, then screw it down clockwise until it’s finger‑tight to restore the watch’s water resistance.

Practical tip: avoid changing the date or moving the hands through midnight between roughly 8:00 PM and 4:00 AM, when the date mechanism is engaged; doing so risks damage to the date change gears.

Key reasons / factors

  • Independent quickset hour hand: Lets you change local time in one‑hour increments without stopping the watch or altering the GMT reference.
  • 24‑hour GMT hand: Keeps track of a second (home) timezone on a 24‑hour scale, preventing AM/PM confusion.
  • Rotatable 24‑hour bezel: Enables reading a third timezone quickly by rotating the bezel to offset hours.
  • Screw‑down crown: Must be properly screwed in to maintain water resistance—essential when setting the watch.
  • Hacking seconds: Stops seconds in the fully‑pulled position for precise time setting and synchronisation.
  • Date mechanism sensitivity: Avoid setting the date during the date‑change interval (approx. 20:00–04:00).

Comparison (if relevant)

Compared with older GMT watches and some non‑Rolex GMTs:

  • Rolex GMT‑Master II vs older GMT‑Master I: The GMT‑Master II has an independently adjustable 12‑hour hand, making local time changes much easier for travellers. Older GMTs typically required moving the hour and the GMT together or relied more on bezel use.
  • Rolex GMT‑Master II vs other GMT movements: Many modern GMT movements offer an independent hour hand, but implementation varies. Rolex’s design is robust and integrates the date to the local hour change, which some users prefer and others find slightly less intuitive if they expect a dedicated date quickset.
  • Rolex vs dual‑time watches (independent subdial): A dedicated dual‑time subdial can show local and home simultaneously without using a bezel, but Rolex’s solution is more traditional, durable, and highly legible for travel use.

Pros and Cons

  • Pros:
    • Easy local time adjustment without stopping the watch.
    • Clear 24‑hour indication for home time to avoid AM/PM errors.
    • Bezel adds flexible third timezone capability.
    • Robust build and secure screw‑down crown for water resistance.
  • Cons:
    • Date quickset is tied to the hour hand; changing date requires stepping hour across midnight.
    • Complexity for first‑time users—beware of date change window (don’t force date during 20:00–04:00).
    • Bezel can be accidentally moved if not careful, changing the displayed timezone offset.

FAQs

Can I change the date manually without moving the hours through midnight?

No dedicated date quickset button exists on the GMT‑Master II; the date advances when the local hour hand crosses midnight. The safe way to change the date is to use the quickset hour function (first crown pull) and step the hour hand forward or backward across midnight until the date changes. Do not do this between ~8:00 PM and 4:00 AM.

How do I set the 24‑hour/GMT hand to my home time?

Pull the crown fully to position 3 (seconds stop). Rotate the crown to set the minute hand and the 24‑hour GMT hand together so the GMT hand points to the correct 24‑hour home time. Then push the crown back one click to set the local hour independently if needed.

How do I read a third timezone with the bezel?

Set the GMT hand to your home time (24‑hour). To read a third timezone, rotate the bezel so the hour offset between the GMT reference and the third zone is represented on the bezel. Read the GMT hand against the rotated 24‑hour bezel numerals to get the third zone time.

Do I need to screw the crown back down every time?

Yes. Always push the crown in and screw it down clockwise until finger‑tight after setting. This preserves the Oyster case water resistance and protects the movement.

What if the watch stops—how many winds are needed?

If the watch has stopped, give it around 20–40 turns of the crown in the winding position to establish power reserve, then set time and date as described. Wearing the watch will keep it wound via the rotor once you’re moving.