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How Does the Time and Date Update on My Forerunner?
The time and date can be adjusted either manually or by acquiring a GPS signal to automatically update. Watches with a GPS receiver will be set to get the time by a satellite signal by default.
To acquire a satellite signal, take the device outside and allow the device to acquire a satellite signal as if you are beginning an activity.
Go outdoors and access an outdoor activity profile, such as Run.
Wait for the GPS ready indicator (this will vary by model, some may say "GPS Ready" some may just have the letters in GPS turn green when a GPS fix is acquired).
To set your watch manually, or to verify the time source is set to automatic see your owner's manual.