One of the features of the second screen on LG V10 is the option to see date and time even if the screen is off. To view date and time on LG V10 when the screen is off, do as follows:
1. Open the Settings app and change the view to List (tap the 3dot icon on the top right and touch the List view option)
2. Now, tap the Second screen option under the Device settings
3. Make sure to toggle the "Show when main screen off" On and then tap the option (tap the text field)
4. There you have 2 options to choose from: Date & time and Signature. Select the Date & Time option and you are all set.
5. The date and time will be always shown on the second screen when the screen is off