Windows normally uses local time which usually corresponds to whatever local timezone you have selected. It allows you to set the hardware clock in your PCs BIOS to UTC time.
By default Windows assumes the time is stored in local time while Linux assumes the time is stored in UTC time and applies an offset.
Hardware clock utc windows. Reliable Hardware Clock RTC Windows does not step time unless certain bounds are exceeded but rather disciplines the clock. The only real issue that Ive had is that OS X like most Unices likes to set the hardware clock to UTC time. The solution for this is either force Ubuntu to maintain the realtime clock in local time or force Windows to use UTC.
Now when you reboot to Windows the time will be off by the exact amount as your local time differs from UTC. Linux machines and others set and use the hardware clock as UTC aka GMT time. Thus when a machine can be dual-booted there is a discrepancy in the reported time.
System time synchronized with the hardware clock. Tested to work on XP Win 7 and Windows 10. Your computer stores the time in a hardware clock on its motherboard.
That means w32tm adjusts the frequency of the clock at a regular interval using the Clock Update Frequency setting which defaults to once a second with Windows Server 2016. The problem is that the timeclock synchronize somehow. On machines using a PC-AT real-time clock by default the hardware clock still has to be set to local time for compatibility with BIOS-based Windows unless using recent versions and an entry in the Windows registry is set to indicate the use of UTC.
For example the UTC time in India is UTC530 so when the time in Windows 10 is off its always 5 hours and 30 minutes behind the actual time. The system time has changed to 2020-01-23T125446500000000Z from 2020-01-23T125547430413900Z. Thus when installing Ubuntu alongside Windows we have to co-operate and also store local time into the.
Here is an event from event viewerits an old event i know. And as BIOS does not really support timezones UTC is the only sensible time for the BIOS and Windows needs additional tweaks to support that. Most Linux distributions set the hardware clock to UTC.
Set Windows clock to UTC time Save the following lines as utcreg and then run it to import this registry tweak. Mikko Rantalainen Oct 22 20 at 1251. My new UTC clock on the PC desktop.
The BIOSUEFI system time is there set to a global harmonised standard UTC. 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. By default Windows uses localtime macOS uses UTC and UNIX-like systems vary.
Alternatively they may also use the hardware clock. Once youve booted Ubuntu it writes the UTC time on the hardware clock. As you probably know linux mostly runs on systems with the hardware clock set to UTC.
In my opinion Linux has the better approach. If you are running Windows and Linux in dual boot you will soon find out that the clocks are not matching. I never tried it on 8.
To fix it either set Ubuntu to maintain RTC in local time or make Windows uses UTC. The standard used by the hardware clock CMOS clock the BIOS time is set by the operating system. Microsoft Windows expects the hardware clock on the machine upon which it is running to be local time.
Windows Registry Editor Version 500. The hardware clock in your system is designed to contain approximately correct time. Apparently Ubuntu keeps the hardware clock in universal time UTC while windows keeps the clock in local time causing a conflict between the mentioned operative systems.
While this is our preferred setting and our default for pristine Ubuntu installations other operating systems such as Windows store local time in the hardware clock instead. I recently discovered a registry tweak that will tell Windows to interpret the hardware clock as UTC time. This causes the clock in Windows XP to be off by 5 hours Im in the central US timezone.
Unfortunately we cant always keep the hardware clock in UTC. An OS that uses the UTC standard will generally consider the hardware clock as UTC and make an adjustment to it to set the OS time at boot according to the time zone. Its old-school Windows SDK a 16K program.
You may decide which solution fits better with your. Disable UTC and use Local Time in Ubuntu. The clock keeps track of time even when the computer is off.
The timezone setting will correct that time to the correct local time. Windows by default expects the computer time to be set to local time while Linux assumes it to be UTC. You can have 1-N clocks though who would need more than 24 and the clocks stay stuck in a selectable corner of the screen.