Open the iOS Settings app.
Select General.
Scroll down and select Language & Region.
Scroll down and select Region.
Select the Region you want and then confirm.
Select your product to confirm this information applies to you
How Do I Change the Time and Date Format on My Paired Smartphone?
The date and upload time for activities in the Garmin Connect™ app will mirror the phone's date and time settings. To change the date and time format in the Garmin Connect app, you will need to change your phone's settings.
NOTE: To change account preferences within the Garmin Connect app or Garmin Connect Web, see Changing Account Preferences in Garmin Connect