Dual Time
Dual Time lets you look up the current time in various time zones around the globe.

Using CASIO WATCHES to Configure World Time City Settings
If the watch is paired with a phone, you can also use the CASIO WATCHES phone app to set the World Time city.
Note
World Time cities that can be selected only by using the CASIO WATCHES phone app cannot be selected using watch operations.
Configuring Dual Time Settings
Dual Time lets you set the current time in another time zone in addition to your current location time.
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Enter the Dual Time Mode.
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Hold down (A) for at least two seconds.
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Use (B) and (D) to set the hour setting.
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Press (C).
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Use (B) and (D) to set the minute setting.
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Press (A) to complete the setting operation.
This causes the hours digits to flash.

This causes the minutes digits to flash.

You can change the setting in 15-minute increments.
Note
While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.
Swapping Current Location Time and Dual Time
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Enter the Dual Time Mode.
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Hold down (B) for at least two seconds.
This swaps your current location time with your Dual Time.

Note
This function comes in handy when you need to move to another time zone. For details about how to use it, go to the section below.
Moving to Another Time Zone
When you enter another time zone, the watch will adjust its time setting to your current location in accordance with the time zone of your phone. When you reach your destination, disable the watch Airplane Mode.

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When you reach your destination, establish a connection between the watch and your phone.
After you disable the watch’s Airplane Mode, it will adjust its time setting to the time in your current location.
If you want to trigger immediate time adjustment, refer to the information at the link below.