Follow below step to remove dual clock from lock screen... 1) Download QuickShortcutMarker 2) Search "clock" 3) Looking for Roaming clock settings com.lge.roamingsettings.uplusroaming..wcdmaroamingRoamingClock or com.lge.roamingsettings.ktroaming.KTRoamingClock 4) press Try 5) Disable "Use roaming dual-clock (show both local and Korean time)"