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How Do PCs and Phones Set Their Own Clocks?

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Get iFixit's Pro Tech Toolkit now for only $59.95 USD at http://ifixit.com/techquickie How do computers and phones set the time all by themselves? Techquickie Merch Store: https://www.designbyhumans.com/shop/LinusTechTips/ Techquickie Movie Poster: https://shop.crowdmade.com/collections/linustechtips/products/tech-quickie-24x36-poster Follow: http://twitter.com/linustech Leave a reply with your requests for future episodes, or tweet them here: http://twitter.com/jmart604 Join the community: http://linustechtips.com Intro Theme: Showdown by F.O.O.L from Monstercat - Best of 2016 Video Link: https://www.youtube.com/watch?v=pm36k08jQ0M&t=2422s iTunes Download Link: https://itunes.apple.com/us/album/monstercat-best-of-2016/id1185092812 Listen on Spotify: https://open.spotify.com/album/5Zt1P3ZbnfErBkiqcfBTCN License for image used: https://creativecommons.org/licenses/by/3.0/legalcode
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Text Comments (741)
Dragonia Gaming (11 days ago)
1:17 He's talking about the boi on the Elizabeth Tower, brits.
Crazyman 123 (18 days ago)
Boy Linus is getting old
19 tech (25 days ago)
You are so old that you predate pizza
Ankit Bishnoi (27 days ago)
But how Offline PC sets their time power is off?
Omar Omario (1 month ago)
I was wondering about this
Pyroman / (1 month ago)
Even though your old as fuck you could still play a highschooler on a t.v. show
KuruGDI (1 month ago)
1:23 _You're Getting Old_ is also an old South Park episode
gameflux (1 month ago)
My brain hurts !
Fabian (1 month ago)
I dont know why i watch this with a bachelors degree in computer science. Techquickie is just entertaining enough i guess :D
Wu Zi Mu (1 month ago)
Oh. You were talking about that clock.
Dowell Boys (1 month ago)
You know what I learned from this video? Linus is old. (so am I... I remember resetting our VCR clocks)
MoViesDProductions (2 months ago)
I remember finding the NTP server box on my first Windows XP machine when I was 12 and thinking to myself "what's NIST?" and changing it to "time.nasa.gov," because that sounded cooler. Sure enough, NASA actually runs an NTP server on that address and it synced, to my surprise.
MrCatFace 8885 (2 months ago)
CMOS battery?
JAYZUPP (2 months ago)
2:03 "yep, there's your problem right there, Jim"
Diego Montilva (2 months ago)
in a nutshell linus is old
chairshoe81 (2 months ago)
okay but my computer hasnt had internet in months and sometimes its left off for weeks and it still has the right time, so how tf does it track time when its off?
time should be in 10s not 24s and 60s darm it
Ocea (2 months ago)
You should do a video about why we cant browse the internet if the PC's date is set wrong
Nigel Johnson (2 months ago)
It might have been worth covering the protocols that compensate for network latency.
Leo Holdiman (2 months ago)
The EA Clock 9 dollars a minute
RD Z (2 months ago)
Lol, I thought this video is about clock speed of processor.
Mathias Gaming (2 months ago)
why did you even bother make a notch on that ANIMATED smartphone 0:42
JHZ Zlice (2 months ago)
How do i download more FPS?
Leo9 (2 months ago)
you delete system32 and your pc will run 10 times faster lol
ANIRUDH .L (2 months ago)
U forgot cmos battery
Who watched this while they are looking forward to high school
Aryaman Mahajan (2 months ago)
Hey linus! I have an iPod Classic. I use it once every 2 years. The battery works for 15 mins and every time that I start it it shows the correct time. I don’t understand how does that machine set its time
8BitGentleman (2 months ago)
0:07 1:17 2:15 In this episode: Linus realizes he's getting old. :smug: Jokes aside, nice video. :thumbsup:
DrawDeath (2 months ago)
um, actually atomic time isn't actual world time
Solarys (2 months ago)
Take a shot every time Linus mentions how old he is.
1castellp (2 months ago)
Why does my alarm not work when I set it?
A Gardiner (2 months ago)
Big Ben is the bell in the Elizabeth town now the clock
Juri Stöckli (2 months ago)
cesium dosn't provide Time, only a frequenc. At the company i work we have multipe timeservers, who get ther time from multiple ggns services and other sources. if one drifts away, the others will notice it and send an alarm.
Alexandru G. (2 months ago)
What if you dont have internet?
Sean Brisson (2 months ago)
Old but gold. never forget. never forgive.
Khalid Abu Shawarib (2 months ago)
1:54 is that James?
Luscious Luchs (2 months ago)
WE GET IT LINUS YOU'RE OLD. I'm 21 and I remember VCRs too. I still have one
jonzuk (2 months ago)
Because it's a smartphone saved you 5 minutes
Anthony Bane (2 months ago)
Big ben is a bell, not a clock
Stormforce VII (2 months ago)
No mention of Greenwich and its role in global time calibration? ok...
SWAGERS (2 months ago)
this isnt LinusTechTips
Zennosuke Zack (2 months ago)
But how do electronics display the correct time even after taking the battery out and even disassembling and reassembling it??
SuperGeneralCrazy (2 months ago)
Big Ben is not the clock, it's the bell. But good video ;')
Haroon Sadaqat (2 months ago)
Uses a pixel 3 but never made a vedio on it
Al Copley (2 months ago)
Nicely done and right on time. Here's a couple of questions that are keeping me awake. Is it possible to quantify the size of the average human brain in terms of memory storage, i.e Gb's/Tb's? And, you clearly have a flair for talking techie facts, were you born with this incredible and vast knowledge? Or do you simply use Amazon Alexa and a handy autocue ? I think a behind the scenes video would reveal your vast empire and team of helpers.
JlXip (2 months ago)
It might have been worth mentioning that the date is really important in cryptography. If you set your clock to decades into the future you will probably not be able to access any HTTPS webpage.
vamwolf (2 months ago)
We need the clock cha7r. For linus.
William (2 months ago)
Thomas Lawson (2 months ago)
I do miss the days.. When I was able to call the atomic clock; as in, "the time lady" as most called it. To get the exact time. 20 years ago in Fort Collins, Co. ahh the good old days. I don't know if it still a working phone number :-/ It was my job to reset the VCR after power outages by calling that number... and waiting for the sound of the beep.
luc0 (2 months ago)
Linus is having a mid life crisis :( He's gonna buy a sports car and dye his hair I'm calling it Linus stop you're not old enough to have a crisis yet
james jason (2 months ago)
What if I pulled out my network cable, shut off the power of the pc and power it back on? How does it account for the passed time?
Really dude, really? Sorry I like most of your stuff but I've just gotta dislike this just for you even thinking answering a question like this deserves a 5 minute video, 2 would've been plenty
GDSpider64 (2 months ago)
Omg i remember needing to reset the time on my VCR and noone knowing how to do it too No im not that old, my family never upgraded from VCRs to DVRs... We also never upgraded to hd until april last year... And never got wifi until november last year... And never got smartphones until the end of 2015... And never upgraded to a fhd tv... And never upgraded to windows 10 until december last year... Maybe i need to stop, im just depressing myself... ._.
Denzel (2 months ago)
My phone is 2 seconds off
Yalkın ÇIRAK (2 months ago)
Memes before the internet? *BLASPHEMY*
Sam Victor (2 months ago)
21% of this video is an ad. Sad.
GuelphRacing (2 months ago)
Hey random person scrolling down the comments..  Have a wonderful day :)
THEBOMBARDEDDJ (2 months ago)
hey could you guys make a vid on amdahl's law?
wobbly sauce (2 months ago)
1:46, ha... I a few that are off by more than 45s.
flamencoprof (2 months ago)
Re the below: - In 2016 I learned that the latest in atomic clocks would neither gain nor lose one second in some 15 billion years—roughly the age of the universe. From my Blog about why we should care about that: - "Well, it turns out that they can be made useful by studying what makes them INACCURATE. Once you have this steady pulse, gravity, magnetic fields, electrical fields, force, motion, temperature and other things can introduce tiny but measurable variations, such measurements becoming a proxy for measuring the actual gravity or force etc. For example, as Einstein predicted, a gravitational field causes time to pass more and more slowly as gravity increases. A clock which is higher is further from Earth, experiences less gravity, and thus runs faster. The new clock is sensitive enough to detect the time shift caused by a rise of only two centimeters! It can thus serve as an extremely accurate measure of height for mapping, and of gravity variations caused by the earth's composition and shape".
Mike Bates (2 months ago)
I believe nist and ntp servers take the client's ping into account.
flamencoprof (2 months ago)
I looked into this in 2014 when I wondered just how accurate the time on my laptop was, and followed the path back to NIST. On the internet, it is NTP that looks after this. Basically, if your device hasn't been connected to the Internet for a while it will slowly get more & more inaccurate. From my Blog at the time (ha-ha): - "Conclusion My computer asks Microsoft the time periodically, and keeps not very accurate time. Amazing, when the internal clock on my laptop runs at 1.50 GHz, i.e. chops time into 1500000000ths of a second, but can't keep accurate time over a few hours. Proper NTP can tolerate and correct a PC's clock that is out by up to +/- 43 seconds a day. Ordinary watches can be a hundred times better than that. "...a typical quartz clock or wristwatch will gain or lose 15 seconds per 30 days (within a normal temperature range of 5°C/41°F to 35°C/95°F) or less than a half second clock drift per day when worn near the body."".
HappyBappyAviation (2 months ago)
Why does windows slow down when there's an update available? Specifically the windows defender antivirus updates that come out multiple times a week.
Kittzy (2 months ago)
4:26 That's how every teacher at school is when someone is late. Billy, you're 50 milliseconds late, go to the office
HabaHax (2 months ago)
Ok but how does a pc track time when switched off and disconnected from the Internet?
Randy Mony (2 months ago)
...at the Tone, the Time will be...
kirbythebamf (2 months ago)
Running out of topics are we?
Uthman Baksh (2 months ago)
No mention of UNIX time?
Aaron Luo (2 months ago)
I'd love to see an episode on PaaS and IaaS!
Davvee (2 months ago)
Well, my PC is 3 hrs ahead and I can't turn the automatic time setting off.. (yes I know how to do it)
Phil O (2 months ago)
Good video linus, informative and entertaining. Thanks!
Xavier Solorzano (2 months ago)
Tech "Quickie"
Julian Oliver (2 months ago)
lol I live in Fort Collins Colorado
Inside the Fence (2 months ago)
But out of the box PC’s have no clue what time it is. Winders 95 could do it
T L S (2 months ago)
I bought an android head unit for my truck from 'carjoying'. It's really great except the clock was an hour behind no matter what I did. I would set it to the right time and turn off automatic time and try every combination of every possibly related setting but no matter what I did, every time I got back in my truck it would be back to an hour behind. UNTIL we set the clocks back an hour a few days ago. Now it's right.
Mario Campos (2 months ago)
I have a diferent opinion when it comes to Mobile devices. I think that they capture the time settings from the mobile equipments on the operators Core Servers (MSCs). Most mobile equipments, due to some caracteristics, don't have NTP server configured, só they send their time settings. The time settings in these equipments have to configured correctly by the analists (My job) so the user does not notice any problems.
0:42 "Let's talk about…" that notch.
Elflord (2 months ago)
This video is missing a: "Vsauce. Linus here"
JuniorBloxHD (2 months ago)
Free skip 0:07
Tim Sievers (2 months ago)
I thought they were going to touch upon how helium can stop the clock on an iPhone... I would love a visual
Richard Moore (2 months ago)
Jeez!!! Don't try so hard, you are just annoying!
Sebastian Kranzinger (2 months ago)
shouldn't it be exactly accurate since it is literally the definition of a second?
Daniel Lenz (2 months ago)
Please don't ask to subscribe before the video has even begun. You should know better.
CodeSecond (2 months ago)
Anybody else wake up and play videos like this playing in your room while You get ready to go
Mayur Valvi (2 months ago)
I always set up the time on our VCR .shit I'm old
Noah McGregor (2 months ago)
i think linus is getting old
WoolFlannel (2 months ago)
the same way a santa climbs into your home and delivers your presents, a brown fello named tyrone climbs into your home and sets the time on all your devices. very convenient 😎
Konsta Kaukonen (2 months ago)
Just about a week ago my windows 10 laptop was about 15minutes off for about an hour. I wonder why that happened? (The automatic time set was on.)
75ur15 (2 months ago)
No mention of the camos battery that keeps the PC clock going even without power
Destiny Fucker (2 months ago)
Hey Vsauce, Michael here
Philip Cooper (2 months ago)
Did you know there are no quartz crystals in VCRs, Microwaves...? They use the frequency of the power grid to keep the time.
Riotlight (2 months ago)
Linus you are so old!! Atomic clocks are things of the past. Nuclear Clocks are better. "A newly proposed nuclear clock would be nearly 100 times more accurate than the best atomic clocks we have now, would be accurate to 19 decimal places and would provide an unmatched tool for applied physics research" "neither gains nor loses 1/20th of a second in 14 billion years – the age of the Universe."
RMoribayashi (2 months ago)
GPS would not work without accurate time, both at your phone and on the satellites. It uses the time each satellite signal takes to get from space to your phone to calculate distances and triangulate your position. BTW GPS is also a working proof of the theory of relativity. The satellites move so fast there is enough time dilation to make the whole system useless unless the math corrects for relativity.
Yemto (2 months ago)
I would be more impressed if a clock was bigger than the Elizabeth Tower, than Big Ben.
Matthew Sibley (2 months ago)
tbh the Ifixit stuff is fuckin' brilliant.
kallus87 (2 months ago)
Make a video how to choose correct SFP module as fast as possible
Tom F (2 months ago)
You just need a fix from gps time on a month. Problem is on android you need to root your phone.
Ateneiro (2 months ago)
I would like to have some video with Jon once in a while :Z
Darwin Bodero (2 months ago)
2:33 The cesium atom is not what oscillates. When the electron in the excited state spontaneously decays back to its ground state it releases a photon back. In an ensemble of such atoms those photons produce an electromagnetic signal, which is to say a light pulse (think radio) which we can detect. The frequency of this signal is what keeps time.
Alex Landherr (2 months ago)
I usually check with time.is to see how well time.windows.com syncs my gaming laptop.
Logan MacGyver (2 months ago)
i still hate oower outages, my alarm clock sucks, it takes 10 minutes to set the time

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