解决Windows和Linux双系统时间不一致的问题

默认情况下 Windows 认为 BIOS 时间为本地时间，而 Linux 则认为 BIOS 时间为 UTC 时间。因此在进行双系统切换后往往导致时间差几个小时的问题。下面是两种方案，任选其一即可。

Make Windows use UTC

Note: This method was not initially supported on Windows Vista and Server 2008, but came back with Vista SP2, Windows 7 and Server 2008 R2.

To make MS Windows calculate the time from the hardware clock as UTC.

Via regedit:

Run regedit and navigate to

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation

Right-click in the right-side panel and select New > DWORD Value. Create the key named RealTimeIsUniversal and give it a value of 1.

Using a registry file

Create a file named WindowsTimeFixUTC.reg with the following contents and then double click on it to merge the contents with the registry:

Windows Registry Editor Version 5.00
 
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]
"RealTimeIsUniversal"=dword:00000001

Make Linux use ‘Local’ time

To tell your Ubuntu system that the hardware clock is set to ‘local’ time:

1. edit /etc/default/rcS

2. Set UTC=yes if your hardware clock is set to UTC (GMT), or UTC=no to have the hardware clock set to local time.

It’s come to my attention that this issue also affects Macs which dual boot via bootcamp or other methods.

Reference

https://mikebeach.org/2011/04/10/windows-linux-dual-boot-system-time-issues/

补充

Ubuntu 16.04 使用 systemd 启动之后，时间也改成了由 timedatectl 来管理，而时间同步也由 timedatectl 进行管理，不再使用 ntpdate。改为执行：

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

https://www.cnblogs.com/EasonJim/p/8111832.html