Time is an element of the overall measurement system of for space. Time can refer to the time it is now, according to timing devices, the interval between two events, the duration of an event, or the sequence of events.

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195
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How do I reset the time on my computer without turning it on?

Alright, so today, I did something very stupid: Do an experiment on my computer without backing it up. So I saw that the calendar in Windows could only go up to 12/31/2999 (or something like that). ...
51
votes
5answers
7k views

Are CPU clock ticks strictly periodic?

Is the frequency of a CPU a mean value of about how many clock ticks there are in a second or does it have a more strong, physical stability? In my opinion, it must be not stable nor unstable. So ...
48
votes
4answers
4k views

NTP - How are NTP servers so accurate

I've noticed that on my servers and other machines the clock always drifts so it has to sync up to remain accurate. How do the NTP server clocks not drift and always remain correct?
37
votes
5answers
4k views

Leap Seconds in Windows

A leap second was recently added on June 30, 2015 23:59:60 UTC. How are leap seconds implemented in Windows (specifically Windows 7)?
37
votes
3answers
7k views

A Windows clock to show both UTC and local time?

I'm working on windows 7 x64 and searching for a way for a setting, or replacement app of, the tray clock (on the taskbar corner) to display both UTC (or GMT) and my local time. Cause: I read log ...
29
votes
9answers
44k views

Show Windows 7 logon time?

On Windows 7 Ultimate, is there a way to see when I logged on into the current session? I want to find out how long I have been at the PC / when I started it up.
26
votes
2answers
46k views

Updating Time : ntpdate[3108]: the NTP socket is in use, exiting

The time on my system is incorrect for some reason. i need to run an update but i can't seem to be able to this is the errror. ntpdate pool.ntp.org 31 Aug 12:31:59 ntpdate[3108]: the NTP socket is in ...
22
votes
4answers
318k views

How can I check a system's current NTP configuration?

I need to verify the current NTP configuration on some Windows systems. Ideally, I'd like to be able to do this via command line instead of navigating through configuration screens. (I'm working on ...
21
votes
7answers
31k views

Windows 7 - display date using small icons

I recently upgraded to Windows 7 and need the date displayed with the time. This works, but only if I use large icons in the taskbar settings which is quite ugly. Any ideas how to display the time ...
17
votes
4answers
1k views

Will overclocking your PC with no internet access screw up the system time?

Let's say you have a PC which is not connected to a time server, so it has no external methods of keeping track of time. You turn the machine on, and set the time and date in the BIOS. Then you ...
15
votes
6answers
7k views

How to prevent Windows 7 from reading the BIOS time?

I'm using the "Time Limit" feature of Windows Live Family safety. I've placed a time restriction on my computer from 12 AM to 4 AM. However if someone changes the BIOS time, the Windows time will be ...
15
votes
4answers
1k views

How do PCs know when the time has changed?

In my country, the official time changes in the first month of spring and fall. When the official time changes, my mobile phone's and PC's clocks change as well. How do these devices find out ...
14
votes
1answer
11k views

Using virtual box is it possible to set your virtual machine time to be different from host time

Using virtual box is it possible to set your virtual machine time to be different from host time. Say 1 year into the past. If I wanted to run the windows XP images provided by Microsoft from here. ...
14
votes
9answers
24k views

Automatically change time based on current location

I often move between 2 time zones, and expect my Windows 7 laptop to somehow automatically change the system time, being spoiled by the same feature on my cell phone. I always assumed that desktop ...
11
votes
2answers
12k views

In Windows 7, how to show day name in system tray clock?

Without installing third-party software, how do I display the day in the clock in the lower-right system tray clock in Windows 7. For example: "Tuesday" (in addition to normal time and date ...
10
votes
6answers
14k views

How to get video duration in seconds?

How can I get video duration in seconds? What I've tried: ffmpeg -i file.flv 2>&1 | grep "Duration" Duration: 00:39:43.08, start: 0.040000, bitrate: 386 kb/s mediainfo file.flv | grep ...
10
votes
3answers
7k views

Can the Windows clock be configured to display a 24-hour-based time? [duplicate]

Is it possible to make the windows clock display its time in a 24-hour format instead of the default 12-hour format? There doesn't appear to be any way to do this via the UI, but I'm wondering if ...
10
votes
4answers
2k views

Is there any software or hardware which lets you stop, slow down, speed up or even reverse time?

Obviously I'm talking about time in terms of the PC clock rather than real time. We were testing an application we've developed at work by setting the clock forward and back to simulate different ...
9
votes
3answers
2k views

Change the output format of zsh's time

I've just switched to zsh. However, I really don't like how the time builtin command also outputs the command that it's timing. I much prefer the bash style output. Anyone know how to switch it ...
9
votes
1answer
10k views

How to synchronize clocks for computers that are not online?

I have some computers that run Windows 7 embedded and are connected to each other by a switch, but are not connected to a larger network or the internet. After a few weeks, the clocks drift and it is ...
9
votes
5answers
50k views

Windows 7 time keeps changing by itself

As the title suggests windows time keeps changing in random times, with random amounts. It sometimes happens every minute, sometimes it is good for hours. If I go hit synchronize with Internet time, ...
8
votes
2answers
2k views

Bash Run command for certain time?

I am making bash script for my use. How can i run a command for certain time, like 20 second and terminate command? I tried a lot of solutions but nothing works, I also tried timeout command with no ...
8
votes
2answers
12k views

Determine the time difference between two linux servers

I am troubleshooting a latency network issue on a network. It is probably a nic or cabling issue, but while I was going through the process of figuring it out, I was looking at the timings of a ping ...
8
votes
2answers
2k views

Is there any command like time, but for memory usage?

Is there any command like time, but that reports more statistics? It would be great if I could do something like: $ statistics some_command time: real 0m3.002s user 0m0.000s sys ...
8
votes
4answers
9k views

Is there any way to properly display negative time spans in Excel?

Is there any way to make Excel show a negative time span? If I subtract two time values (say, when subtracting the actual amount of time spent on something from the amount of time planned for it) and ...
8
votes
1answer
4k views

How to increase frequency of time server synchronisations?

I have a that PC (Windows XP SP3) keeps losing time whereby it ends up being about 5 mins slow per day from all the other PCs and clocks about the place. Is there a way to increase frequency of ...
8
votes
3answers
22k views

I get “An error occurred while Windows was synchronizing with [name of time server].” when trying to automatically synchronise PC time

Prompted by the answers to this question I decided to give the Windows built in time synchronisation another go. However, no matter what time server I use I get this error: "An error occurred while ...
7
votes
5answers
52k views

How to get time difference as minutes in Excel?

I have time values in two cells in an Excel sheet and I need the difference of the times in minutes. The cells in the Excel are like below: A B C 1 6:38 8:23 1:45:00 A is ...
7
votes
4answers
8k views

Timezone conversion by command line

I know about http://www.timeanddate.com/worldclock/converter.html I can't figure out how to query http://www.google.com in a sane natural format like "5pm BST in PST". Or do I have to write such an ...
7
votes
3answers
4k views

Does it matter which NTP time server do I choose in Windows?

When enabling Windows to set system time via Internet, I'm presented with the following dialog: Does it matter which time server I choose? How would I know if one was "better" than the others?
7
votes
6answers
25k views

how long to zero a drive with dd? [closed]

How long will it take to zero fill 1TB (using dd dev/zero)? I'm actually doing two 500G drive simultaneously if it matters.
7
votes
3answers
3k views

Fastest booting desktop linux distro? [closed]

I'm currently running Ubuntu 9.04 on my laptop and I'm very happy with it. But boot times aren't great... So I'd like to have a second distribution on my hard disc that I can boot to quickly check my ...
7
votes
2answers
5k views

Is it possible to set wget to show the transfer times in milliseconds?

Generally, wget shows transfer times in seconds. Is there a way I can to make it show the time in milliseconds?
7
votes
2answers
3k views

Clock running fast after OS X Mavericks install

I've noticed my OS X system time on my iMac is running faster after I updated to Mavericks, after about a week it is a good 4 or 5 minutes too fast. In my Date & Time preferences everything is ...
6
votes
4answers
6k views

Easiest way to time a command line tool

What is the easiest/quickest way to time a command line tool? It doesn't have to be super accurate (+/- seconds is okay) since I expect this to take minutes or even 1 hour+. And writing a batch file ...
6
votes
4answers
6k views

How to force 'shutdown' at predefined time, in administrator account?

I want to force a Windows7 Professional home pc, single administrator account, to shut down every day at a predefined time (e.g., 10pm). I want to make it cumbersome for the user to interfere with the ...
6
votes
3answers
7k views

Network latency measurement (Linux)

I'd like to measure network latency for SNMP GET request. There is a free command line tool time which can be used to find timing statistics for various commands. For example it can be used with ...
6
votes
1answer
2k views

How can I give arguments to time command (ubuntu)

I want to get a bit more information than the standard time command gives, so I want to pass the verbose flag. info time gives as example time -v sleep 4, however when I execute that (both in bash or ...
6
votes
3answers
17k views

How to set Debian to automatically update time and date?

I have an old computer and BIOS counts the time slower than real ;) So, how can I set my OS to update the time automatically using the internet? If it updated the time only during booting, it would ...
6
votes
1answer
606 views

How do I use options with time?

Whenever I try to use options with the time command, such as format (-f, --FORMAT), I get the following error: bash: -f: command not found How do I use options with time?
6
votes
2answers
2k views

Fully featured time command on Mac OS X?

On some unix systems I've been used to a time command which many options including ways to format the output (-f) and redirect the output to a file (-o), see for example this man entry of time. ...
6
votes
1answer
2k views

What is the difference between “stop the task if it runs longer than” inside Trigger and under Settings tab?

When I schedule a task in Windows Task Scheduler, I can set "stop the task if it runs longer than" inside task trigger or inside Settings tab. If I set it inside the trigger it does not automatically ...
6
votes
1answer
508 views

REPORTTIME for Bash

Zsh has an ingenious feature that automatically prints timing statistics for commands taking longer than $REPORTTIME to execute. Think of it as automatically executing a pipeline through time as ...
5
votes
5answers
10k views

How to show date with clock when Windows 7 taskbar is vertical?

On widescreen Windows 7 desktops, I prefer a vertical taskbar with small icons. However, this appears to remove the date from the clock display. Here's what it looks like, missing the date. How ...
5
votes
3answers
326 views

How does operating system software maintains time clocks?

This may sound a bit less relevant but I couldn't think of a better place to ask this question. Now consider this situation, you install an OS on your system, set the timezone and time, do some stuff ...
5
votes
2answers
36k views

How do you retrieve the current time on a server?

I want to know the time on a server accurate to the millisecond. there's this way: local $ ssh user@servername Welcome to server! server $ date Fri Feb 18 11:27:50 EST 2011 But I need more ...
5
votes
3answers
4k views

How is time measured in computer systems?

Something I have been puzzled about is this: how exactly does a computer regulate and tell time? For example: if I were to write a program that did this: Do 2+2 then wait 5 seconds How does the ...
5
votes
3answers
60k views

Can't synchronize time, Windows 7

Ok, I finally installed Windows 7, clean install. Time synchronization does not work. Clicking "Update now" gives message: Unable to start the Windows Time service. Please try again later. I use ...
5
votes
4answers
28k views

How to calculate hours and minutes between two time periods?

I’m working on a very simple time sheet for my work in Excel 2007, but I have run into trouble about calculate the hours and minutes between two time periods. I have a field: timestart which could be ...
5
votes
3answers
534 views

What is starting date for real time clock? [closed]

Windows uses January 1, 1601 as starting date. What does Real time clock use? If it uses different starting date, does Windows convert its timestamp(because it uses its date and time) into its own? ...