![]() So everytime you switch OS, one screws other's time. Windows does not properly handle BIOS-set-as-UTC. In most cases, I would recommend to set BIOS to UTC time.īut if you dual boot with Windows. The problem is if it thinks your BIOS is UTC and it's actually local time your hwclock is always going to be out of sync and when it uses timezone data like it would on a UTC clock you are going to end up with the wrong time. Otherwise, if the hardware clock is set to localtime, more than one operating system may adjust it after a DST change for example, thus resulting in an over-correction problems may also arise when traveling between different time zones and using one of the operating systems to reset the system/hardware clock.Ĭheck what your setting in /etc/default/rcS are if it is UTC=yes then set it to UTC in your BIOS and Kubuntu will use your time zone file adjust it properly. If multiple operating systems are installed on a machine, they will all derive the current time from the same hardware clock: it is recommended to adopt a unique standard for the hardware clock to avoid conflicts across systems and set it to 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. By default, Windows uses localtime, macOS uses UTC, and UNIX-like systems vary. The standard used by the hardware clock (CMOS clock, the BIOS time) is set by the operating system. Click Add Clocks For Different Time Zones (Windows 10) or the Additional Clocks tab (Windows 7) Select Show This Clock, pick a time. Though conceptually different, UTC is also known as GMT (Greenwich Mean Time). ![]() The localtime standard is dependent on the current time zone, while UTC is the global time standard and is independent of time zone values. There are two time standards: localtime and Coordinated Universal Time (UTC). The Arch Linux wiki explains well the drawbacks of using local time for hardware clock: Most operating system considers the hardware clock to be UTC except Windows for ridiculous compatibility reasons and supposedly to avoid confusing users when setting time via bios (!) (comments on this blog post are worth reading by the way) See option 2 on this tutorial if this help. To change Windows use UTC -time you need to change one registry setting. ![]() Disable Windows Time Service by running this command: sc config w32time start= disabled Answer Pauli O Replied on FebruBy default Windows 10 use time as local time.In the registry, under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation, add a key RealTimeIsUniversal with a value 00000001 of type dword.To have Windows consider the hardware clock as UTC, do the following: :: THE SOFTWARE IS PROVIDED 'AS IS' AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. We are in 2018, hardware clock should be set to UTC time, even for Windows dual-boot. :: Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted.
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