dual boot How to Fix Time Differences in Ubuntu 16.04 & Windows Dual Boot

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How to Fix Time Differences in Ubuntu 16.04 & Windows Dual Boot

 

 

For users who dual boot Ubuntu 16.04 and Windows, you may find the clock time is off that causes time differences after you reboot and switch between the two systems. Here’s how to fix it.

 

Ubuntu maintains the hardware clock (RTC, real time clock) in universal time (UTC) by default while Windows maintains the clock in local time, thus causing time conflicts between Ubuntu and Windows.

 

To fix it, either set Ubuntu to maintain RTC in local time or make Windows uses UTC.

1. Disable UTC and use Local Time in Ubuntu:
   In previous Ubuntu editions, you can edit the config file to disable UTC.

   /etc/default/rcS

   In Ubuntu 16.04, open terminal (Ctrl+Alt+T) and run the command below instead:

   timedatectl set-local-rtc 1 --adjust-system-clock

   To check out if your system uses Local time, just run:

   timedatectl

   you’ll see the local time zone is in use in the Warning section.
   
   
   
   Finally restart and switch to Windows, adjust system clock time if need and done.
    

2. Make Microsoft Windows uses UTC:
   Another way to fix this issue is doing the following changes in Windows, in the case below:

   1. First if you’ve switched to local time in Ubuntu, run command in Ubuntu terminal to use back UTC:

      timedatectl set-local-rtc 0

   2. Restart and select boot into Windows, when you’re in, do:

      • go to Start Menu, search for and launch cmd as Administrator.

      • When the command console opens, paste below command to create a DWORD value to the registry:

        Reg add HKLM\SYSTEM\CurrentControlSet\Control\TimeZoneInformation /v RealTimeIsUniversal /t REG_DWORD /d 1

        For 64-bit Windows, use a QWORD value instead:

        Reg add HKLM\SYSTEM\CurrentControlSet\Control\TimeZoneInformation /v RealTimeIsUniversal /t REG_QWORD /d 1

        
      • Disable the “internet update” for the time and reboot.

 

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