LINK AS 3055960 - Caterpillar

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Date and Time
Press the "Change" button. This button will launch the "Date and Time" dialog box.
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Time Zone
Select the local time zone from the drop-down list.
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Local Date and Time
Enter the local date and time. Use an accurate reference to set the time. Note: Laptop clocks are not accurate and may have a different time than the local time.
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ET Display
Then press the "OK" button. The Cat ET will display the following message.
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Cat ET Time Confirmation
Click on the "Yes" button in order to change the date and time or click on the "No" button in order to cancel the change. The Cat ET will display the new time on a 24 hour clock.
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Cat ET Display 24 Hour Clock