What is the procedure for setting the date and time on a Garmin Forerunner 645?

To set the date and time on a Garmin Forerunner 645

follow these steps:

1. Press the "Up" or "Down" buttons on the side of the device to navigate to the watch face.
2. Press and hold the "Up" button to enter the menu.
3. Scroll down and select "Settings" by pressing the "Start/Stop" button.
4. Scroll down and select "System" by pressing the "Start/Stop" button.
5. Scroll down and select "Time" by pressing the "Start/Stop" button.
6. Select "Set Time" by pressing the "Start/Stop" button.
7. Use the "Up" and "Down" buttons to adjust the hours, minutes, and seconds.
8. Press the "Start/Stop" button to save each selection and move to the next field.
9. After setting the time, press the "Light" button to toggle between AM and PM.
10. Press the "Start/Stop" button to save the AM/PM selection.
11. To set the date, scroll down and select "Set Date" by pressing the "Start/Stop" button.
12. Use the "Up" and "Down" buttons to adjust the month, day, and year.
13. Press the "Start/Stop" button to save each selection and move to the next field.
14. After setting the date, press the "Light" button to toggle between different date formats if desired.
15. Press the "Start/Stop" button to save the date format selection.
16. Once you have set the date and time, press the "Back" button multiple times to return to the watch face.

The date and time should now be set on your Garmin Forerunner 645.