Clock time is off on dual boot

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Quick tip for users who dual boot Ubuntu and Windows: if the time is off on your computer when you reboot and switch between Ubuntu and Windows, here's how to fix it.

If you dual boot and there are time conflicts between Windows and Ubuntu, this occurs because Ubuntu store the time on the hardware clock as UTC by default while Microsoft Windows stores the time as local time, thus causing conflicting times between Ubuntu and Windows.

The fix is pretty easy and it can be applied from both Ubuntu and Windows.

Fix time differences between Ubuntu and Windows


A. To fix the UTC / local time difference between Ubuntu and Windows from Ubuntu

by making Ubuntu use local time.

Before proceeding, note that according to the Ubuntu wiki, "the advantage of having the hardware clock as UTC is that you don't need to change the hardware clock when moving between timezones or when Daylight Savings Time (DST) begins or ends as UTC does not have DST or...

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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 /etc/default/rcS to disable UTC.

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 the local time zone is in use in the Warning section.

Finally restart and switch to Windows, adjust system clock...

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If you dual boot your Windows PC with OS X or Linux, you may have experienced a problem in which your clocks reset themselves incorrectly every time you boot into Windows. Here's a simple registry edit to fix that.

Essentially, the incorrect clock setting happens because OS X and Linux use GMT time while Windows tries to synchronize with your local time zone, getting confused when you reboot between the two. Apple's own Boot Camp drivers for Windows are supposed to fix this problem, though some users have noticed that it still happens even with the drivers installed, and some Linux users are left out in the cold. Furthermore, if you have a Hackintosh, you can't install the Boot Camp drivers, so you'll need to find another way around the problem.

To fix it, just hit Start and type regedit.exe in the search box. Hit Enter and navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation. Right click anywhere in the right pane and hit New > DWORD...

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This article or section needs expansion.

Reason:

This article mostly documents

systemdtimedatectl

; explain basic commands like

date

and

hwclock

first (Discuss in

Talk:Time#

)

In an operating system, the time (clock) is determined by four parts: time value, time standard, time zone, and Daylight Saving Time (DST) if applicable. This article explains what they are and how to read/set them.

Hardware clock and system clock

A computer has two clocks that need to be considered: the "Hardware clock" and the "System/software clock".

Hardware clock (a.k.a. the Real Time Clock (RTC) or CMOS clock) stores the values of: Year, Month, Day, Hour, Minute, and the Seconds. It does not have the ability to store the time standard (localtime or UTC), nor whether DST is used.

System clock (a.k.a. the software clock) keeps track of: time, time zone, and DST if applicable. It is calculated by the Linux kernel as the number of seconds...

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Introduction

This article is intended for three different types of Linux user:

1) This article will be of interest to you if you only run Linux on your PC and are having trouble getting the clock on the Panel to display the correct time. 2) If you only run Linux on your PC then this article will also be of interest to you if you need to know the time in other timezones (perhaps you have friends or relatives in other timezones, or you have a laptop and take it with you to other timezones). 3) If you dual boot with Windows then this article is also applicable.

This article covers Gentoo/Sabayon Linux before and after migration to Baselayout-2 and OpenRC (as covered in the Gentoo Baselayout and OpenRC Migration Guide). Any differences to clock and timezone-related files before and after migration are indicated in the article. If you are using Sabayon Linux 3.5 or a later version then you are already using Baselayout-2 and OpenRC. If you are using Sabayon...

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This question already has an answer here:

Other Tips. This is the actual configuration file for the olcDatabase={1}hdb. # AUTO-GENERATED FILE - DO NOT EDIT!! Use ldapmodify. # CRC32 be185314 dn: olcDatabase={1}hdb objectClass: olcDatabaseConfig objectClass: olcHdbConfig olcDatabase: {1}hdb olcDbDirectory: /var/lib/ldap olcSuffix: dc=com olcAccess: {0}to attrs=userPassword,shadowLastChange by self write by anonymou s auth by dn="cn=admin,dc=com" write by * none olcAccess: {1}to dn.base="" by * read olcAccess: {2}to * by self write by dn="cn=admin,dc=com" write by * read olcLastMod: TRUE olcRootDN: cn=admin,dc=com olcRootPW:: e1NTSEF9RjNoaGU4VFpWb1BLSmxvQmZ3Y2NaakdyTXhGRDlJMnc= olcDbCheckpoint: 512 30 olcDbConfig: {0}set_cachesize 0 2097152 0 olcDbConfig: {1}set_lk_max_objects 1500 olcDbConfig: {2}set_lk_max_locks 1500 olcDbConfig: {3}set_lk_max_lockers 1500 olcDbIndex: objectClass eq structuralObjectClass: olcHdbConfig entryUUID: d5337954-b602-1034-85da-51fd8ac209c0...

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Dual Boot Windows and Ubuntu – Fix time differences between Ubuntu and Windows. How to fix time differences in Ubuntu 16.04 and Windows 10. For a dual boot system, the clock time is off and causes time differences after each system reboot.

The problem arises because, Ubuntu System maintains the clock in universal time (UTC) and Windows System maintains the clock in local time. To fix the time differences, either:

Disable UTC and use Local Time in Ubuntu Make MicroSoft Windows uses UTC

Disable UTC and use Local Time in Ubuntu:

Run the following commands in Terminal to disable UTC and use Local Time in Ubuntu 16.04:
timedatectl set-local-rtc 1 --adjust-system-clock
Now run the command given below to verify/check if Ubuntu system uses Local time:
timedatectl

Warning: The system is configured to read the RTC time in the local time zone. This mode can not be fully supported. It will create various problems with time zone changes and...

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1. Why does this happen?

The simple explanation is; Windows uses Greenwhich time, and OSX uses Universal Time. It's as simple as that. Every time the other OS boots up - it changes around your BIOS settings in-order to 'correct' the CPU clock timer - which is essential for any computer to calculate things correctly.

2. What's the difference?

Windows is always defaulted to use GMT as the location to set the time and date. GMT stands for 'Greenwich Observatory'. This observatory broadcasts the current time of the world based on the calculations of where the Earth rotation is in relation to the prime meridian.

Because of the fact that GMT is outdated - it doesn't consider other factors that are important to calculating time - such as; where the earth is in relation to the sun. Because of this - GMT is pretty much an 'average' or an estimated guess as to what time it is where you live.

To quote the Greenwich website...


As more...
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Occasionally some users have the need to reset their Manjaro system's time/date. Beginners can achieve this by using the Manjaro Settings Manager and clicking on "Time and Date".

For intermediate and advanced users, an easy process involving a few steps at the command line is described in this paragraph.

The following command:

[handy@jarmano ~]$ timedatectl status

Gives this output on my machine:

[handy@jarmano ~]$ timedatectl status Local time: Mon 2013-07-08 10:21:32 WST Universal time: Mon 2013-07-08 00:21:32 UTC RTC time: Mon 2013-07-08 00:21:32 Timezone: Australia/Perth (WST, +800) NTP enabled: no NTP synchronized: no RTC in local TZ: no DST active: no Last DST change: DST ended at Sun 2013-04-07 02:59:59 WST Sun 2013-04-07 02:00:00 WST Next DST change: DST begins (the clock jumps one hour forward) at Sun 2013-10-06 01:59:59 WST Sun 2013-10-06 03:00:00 WST

The above output has the wrong...

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Operating systems store and retrieve the time in the hardware clock located on your motherboard so that it can keep track of the time even when the system does not have power. Most operating systems (Linux/Unix/Mac) store the time on the hardware clock as UTC by default, though some systems (notably Microsoft Windows) store the time on the hardware clock as the 'local' time. This causes problems in a dual boot system if both systems view the hardware clock differently.

The advantage of having the hardware clock as UTC is that you don't need to change the hardware clock when moving between timezones or when Daylight Savings Time (DST) begins or ends as UTC does not have DST or timezone offsets.

Changing Linux to use local time is easier and more reliable than changing Windows to use UTC, so dual-boot Linux/Windows systems tend to use local time.

Since Intrepid (8.10), UTC=yes is default.

Make Windows use UTC

Note: This method was not...

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If you have a computer where a Linux OS (e.g. Ubuntu) is dual-booted with Windows, you will notice that, every time you reboot from Linux to Window, clock time displaying incorrectly in Windows. Even some Linux may show incorrect time if you are returning from Windows. Here’s how to solve this.

To keep track of proper time, Operating Systems make use of BIOS time settings from your computer’s motherboard. Because BIOS has the ability to keep running the clock even if your system is turned off (using CMOS memory and battery). Different Operating Systems may use different methods to store clock/time information in BIOS. For example, Unix and Linux based systems (e.g. Debian, Ubuntu, Mac, BSD, etc.) use “UTC” time format while Windows uses “Local time” format to write to BIOS clock settings. UTC (GMT) is better as you don’t have to change hardware time when you move to another timezone.

The problem happens when you install multiple Operating Systems with...

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The Clock Mini-HOWTO: How Linux Keeps Track of Time Next Previous Contents

A Linux system actually has two clocks: One is the battery powered "Real Time Clock" (also known as the "RTC", "CMOS clock", or "Hardware clock") which keeps track of time when the system is turned off but is not used when the system is running. The other is the "system clock" (sometimes called the "kernel clock" or "software clock") which is a software counter based on the timer interrupt. It does not exist when the system is not running, so it has to be initialized from the RTC (or some other time source) at boot time. References to "the clock" in the ntpd documentation refer to the system clock, not the RTC.

The two clocks will drift at different rates, so they will gradually drift apart from each other, and also away from the "real" time. The simplest way to keep them on time is to measure their drift rates and apply correction factors in software. Since the RTC is only used when the system is not...

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Check to be sure you have all your updates. What can happen as well, in the US, within the last couple of years they changed the days that daylight savings time takes effect. Could be that your software needs a patch to tell it that if the same is true for you. Al;so, in your clock, check your time zone setting. I've seen it happen that a system was older, needed that update I mentioned, and it was set to update time with the web, so what I think actually happened was that I had to check the time zone and turn off the updating so that it would stop what you are describing. One of those weird issues.

But to check the settings for syncing the internet time, click the clock in the start menu, click change date and time settings. Click on Internet Time, click change settings. In there there should be a box to uncheck to disable it syncing with the web. But check the time zone first. If it keeps time on leopard, the cmos battery should be fine, it would have to be a software...

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Sometimes when you set up a dual-boot system, things can get a bit weird with the time and clock settings, so how do you fix the problem? Today’s SuperUser Q&A post has the perfect solution to help a frustrated reader fix his dual-boot clock woes.

Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites.

Photo courtesy of Straws pulled at random (Flickr).

The Question

SuperUser reader arielnmz wants to know how to get both of the clocks on his dual-boot Windows/Linux setup to display the proper, and matching, times:

Ever since I started using Linux in a dual-boot set up with Windows, I have noticed when I rebooted the machine, the time on the other operating system was wrong (for example, 12:00 on Linux, reboot to Windows and see 18:00). When I checked the BIOS, the RTC was set to 18:00.

Since my time zone is -06:00 CST, I assume Linux just...

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I’ve been testing a number of tablets, notebooks, and other computers that can dual-boot Android and Windows recently. And I’ve noticed that many of them have the same problem: set the time in Windows, reboot into Android, and when you reboot into Windows again the time will be off by several hours.

It turns out that this is a long-running issue with computers that dual-boot Windows and alternate operating systems. And there’s a pretty simple fix.

Background

Windows uses your local time zone to set the time, but most other operating systems including OS X, Android, and many Linux distributions use Universal Time, or GMT to keep track of time and then convert that into your local time zone.

You could theoretically change set some of those operating systems to use LocalTime… but it’s easier to set Windows to Universal Time.

Note that the steps outlined below only work reliably if you’re using Windows 7 or later. But really, you should be....

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There are many things that most people take for granted. One of them is that clocks always show the current time. When you tend to rely on your computer’s time and your computer clock loses time, this can be fatal.

There are several situations where the Windows clock starts showing the wrong time. If you’re obsessed with having the exact time on your computer no matter what, you may want to set up synchronization with a remote server. Before you do that however, please note that an inaccurate Windows clock should not be taken lightly.

If the computer clock loses time although you keep fixing it, there may be a serious cause. This article shows you what the underlying causes may be and how you can fix them.

1. CMOS Battery

This is the most likely scenario, especially if your computer is not brand new.

The CMOS battery sits on your computer’s motherboard and provides power to the Complementary Metal Oxide Semiconductor (CMOS) chip. The CMOS chip...

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This page gives useful information about the way that Ubuntu manages time by changing the timezone, setting up synchronization using Network Time Protocol (NTP), and adjusting servers.

This section shows you how to accomplish this task using either the Graphical User Interface (GUI) or by using the command line (terminal).

Using the GUI

Perhaps the most user friendly way to change the time zone of your Ubuntu system is to use the Graphical User Interface (GUI).

Click on the System menu on the top panel, go into the Administration sub-menu, and click on Time and Date.

Click on the currently selected time zone to bring up the selection map.

Click in the general area of your location on the time zone map, the map will zoom in.

Select the closest city then choose Close

Using the Command Line (terminal)

Using the command line, you can use sudo dpkg-reconfigure tzdata.

Open a terminal...

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