Hold , and select Settings > System > Time.

Time Format

Sets the watch to show time in a 12-hour, 24-hour, or military format.

Time Source

Sets the time for the watch. The Auto option sets the time automatically based on your GPS position.

Time

Adjusts the time if the Time Source option is set to Manual.

Time Sync

Allows you to manually sync the time when you change time zones, and to update for daylight saving time.