How to Set a GMT Watch

Step 1: Identify Your GMT Movement Type in 10 Seconds

GMT watches use two unique mechanical architectures. Setting your watch in the wrong sequence throws off your date sync and forces you to start over. Unscrew your crown (if it has threads) to reach Position 0. Pull the crown out one click to Position 1 and turn it in both directions:

• Caller (Office) GMT: Turning the crown in Position 1 moves the 24-hour GMT hand in one direction and the date wheel in the opposite direction.
• Flyer (Traveler) GMT: Turning the crown in Position 1 jumps the main 12-hour hand forward or backward in one-hour increments. It has no dedicated quickset date lever because the 12-hour hand drives the date wheel.

The table above shows how crown rotation differs across the five most common GMT movements. Check your watch caseback or spec sheet to match your calibre before turning the crown.

Read: Types of Watch Movements

Step 2: How to Set a Caller (Office) GMT Watch

A Caller GMT links the date wheel to the standard 12-hour hand. Use this setup when you stay in one place and track a second time zone for business calls or family abroad.

1. Rotate the bezel to neutral: Align the 24-hour bezel triangle with the 12 o’clock dial marker.
2. Clear the date danger zone: Pull the crown all the way out to Position 2. Turn the hands forward until the 12-hour hand sits at 6:00 AM so the date jumper tooth disengages from the date wheel.
3. Set your local time: Keep the crown in Position 2 and rotate the hands until the main 12-hour and minute hands show your current local time. Pay attention to AM and PM by watching when the date clicks over at midnight.
4. Set the GMT hand and date: Push the crown in one click to Position 1. Turn the crown in one direction to align the 24-hour GMT hand with your reference time zone on the 24-hour scale, then turn it the opposite way to set today’s date.
5. Lock the crown: Push the crown back to Position 0 and screw it down against the case to seal the gaskets.

Step 3: How to Set a Flyer (Traveler) GMT Watch

A Flyer GMT links the date wheel to the jumping 12-hour hand instead of the 24-hour hand. You must set the 24-hour hand first, because moving the 24-hour hand also moves the minute and 12-hour hands together.

1. Center the bezel: Line up the 24-hour bezel marker with 12 o’clock.
2. Set your home time on the GMT hand: Pull the crown all the way out to Position 2. Rotate the crown to align the 24-hour hand and minute hand with your home time, reading the hours off the 24-hour bezel or chapter ring.
3. Jump the 12-hour hand to local time: Push the crown in one click to Position 1. The second hand will start ticking again while you jump the 12-hour hand in one-hour steps to match your current local time and date.
4. Reverse the date if needed: If your local date is one day behind your home date, jump the 12-hour hand backward past midnight in Position 1. Flyer movements allow backward date changes without damaging the gear train.
5. Secure the crown: Push the crown to Position 0 and screw it down.

Also Read: How are Loose Crown Guards Fixed on Panerai Watches

How to Read the 24-Hour Scale Without Confusion

Your watch dial has two time scales. The main hour markers run from 1 to 12, while the outer bezel or inner chapter ring runs from 1 to 24.

• Read the 12-hour hand: Look only at the standard dial markers (1 through 12). Ignore the 24-hour bezel when checking this hand.
• Read the 24-hour GMT hand: Look only at the 24-hour bezel or chapter ring. If the GMT hand points straight down at the 6 o’clock marker, the time in that zone is 12:00 PM (noon), not 6:00.
• Read the minute hand: Both time zones share the same minute hand on standard hour-offset zones.

How to Track a Third Time Zone Using the Bezel

If your watch has a rotating 24-hour bezel and a separate 24-hour scale printed on the dial or chapter ring, you can read three time zones at once. If your watch only has numerals on the bezel and none on the dial, rotating the bezel temporarily replaces your second time zone until you rotate it back to 12 o’clock. Use this formula to calculate your bezel rotation without counting on your fingers:

Target UTC Offset minus Home UTC Offset = Bezel Clicks

• Positive result (+): Rotate the bezel counterclockwise by that number of hours.
• Negative result (-): Rotate the bezel clockwise by that number of hours.

For example, if your GMT hand tracks London (UTC+0) and you want to check Tokyo (UTC+9), subtract 0 from 9 to get +9. Rotate the bezel 9 hours counterclockwise so the 9 on the bezel sits at the 12 o’clock position. Read the GMT hand against the rotated bezel to see Tokyo time.

How to Set Half-Hour and 45-Minute Offset Time Zones

Cities like Mumbai (UTC+5:30), Kathmandu (UTC+5:45), and Adelaide (UTC+9:30) do not align with full-hour marks. Because the minute hand is fixed to your local time, you have two ways to handle fractional time zones:

• Use a 48-click bezel: Many microbrand and pilot GMT watches feature 48 clicks on the 24-hour bezel, where each click equals 30 minutes. Rotate the bezel by the exact number of half-hour clicks and add 30 minutes to your mental minute count.
• Make the fractional zone your primary time: On a Flyer GMT, set the minute hand and 24-hour hand to the fractional zone (such as India) in Position 2, then jump the 12-hour hand to your closest hour in Position 1. This gives you exact minute accuracy for the fractional zone while keeping your local hour close for quick reference.

Common Mistakes That Damage GMT Movements

• Forcing a Caller GMT date change at night: According to Aiman Moner, our master watchmaker at ChronoStreet, between 9:00 PM and 3:00 AM, the date driving wheel engages the date ring teeth. Using the Position 1 quickset during this window shears the brass teeth off the date jumper wheel.
• Forgetting to adjust for Daylight Saving Time (DST): UTC never changes, but local regions shift by one hour twice a year. On a Flyer GMT, pull the crown to Position 1 and jump the 12-hour hand one click forward or backward without stopping the watch or touching the minute hand.
• Turning a Caller GMT hand the wrong way: Most Caller movements only move the 24-hour hand in one direction. If you overshoot your target hour on a Seiko NH34 or ETA 2893-2, do not reverse the crown because turning it backward will flip your date wheel ahead by one day. Cycle the GMT hand all the way around the 24-hour dial instead.

Frequently Asked Questions (FAQs)

What should I set my GMT hand to if I do not travel?

Set the 24-hour hand to your current local time so it acts as an AM/PM indicator, or set it to Coordinated Universal Time (UTC) if you follow global financial markets, aviation schedules, or international sports. Syncing it to your local time also tells you whether a stopped watch paused at noon or midnight before you adjust the calendar.

Why do GMT watch bezels have two colors?

Two-tone bezels divide the 24-hour scale at the 6 and 18 markers to separate daytime from nighttime in your second time zone. The lighter bottom half (red, blue, or white) marks daylight hours from 6:00 AM to 6:00 PM, while the darker top half (black or navy) marks night hours from 6:00 PM to 6:00 AM.

How do you set a GMT watch with a fixed bezel?

You set a fixed-bezel GMT, such as a Rolex Explorer II or Tudor Black Bay Pro, using the same crown positions as a rotating-bezel watch, reading the 24-hour hand against the engraved steel bezel. Because the bezel does not turn, the watch tracks a maximum of two time zones instead of three.

Why does my GMT hand not line up with the dial markers?

The 24-hour hand travels 15 degrees per hour, half the speed of the 12-hour hand. On a 12-marker dial, the GMT hand points at an hour marker only on even hours (02:00, 04:00, 06:00) and rests between markers on odd hours. If the hand misses the 24-hour bezel mark when the minute hand reaches 12 o’clock, a watchmaker needs to remount the hand on its post.

Can you use the GMT hand as a compass?

Yes, if you sync the 24-hour hand to your current local time and keep the bezel centered at 12 o’clock. Hold the watch level in the Northern Hemisphere and point the 12-hour hand at the sun; the 24-hour GMT hand will point North.