How Do PCs and Phones Set Their Own Clocks?
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How do computers and phones set the time all by themselves?
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@Mr_Spock512 5 жыл бұрын
You youngin's have a lot to learn ... when I was just a young pup, we used solar clocks. The bad part was that we had no time reference on cloudy days ... the good part was that we had a ready made excuse for being late to school. I prayed for rainy weather every day.
@DrPenguin 5 жыл бұрын
Like magic because that’s all computers are made of Magic Because they just work
@luqdude 5 жыл бұрын
“Dad, what’s a computer?” “It’s magic Joel”
@Kaelygon 5 жыл бұрын
Just like Ray Tracing. Because, it just works.
@darknes4150 5 жыл бұрын
Luqman Headley fucking hell I was gonna say that
@BBCR123 5 жыл бұрын
@@luqdude Ever since that day. Ever since that day, little Joel was not the same.
@LukePlaysGames 5 жыл бұрын
Computer Working? Speak for yourself.
@kittzy3598 5 жыл бұрын
4:26 That's how every teacher at school is when someone is late. Billy, you're 50 milliseconds late, go to the office
@oscarosullivan4513 3 жыл бұрын
Get in early
@WSTFilmsProd 5 жыл бұрын
Wasn´t paying attention for like 10 Seconds and he went from setting time on a vcr to atoms and molecules and all that stuff. Thought I was watching another video.
@MammothBehemoth 5 жыл бұрын
lol, same here. Memes are my trigger words for mind wandering
@Donbros 5 жыл бұрын
It is funny how I spoke with my family member about this things (automatic clocks) and that today I had to speak at university about those electrons activation and photons
@xil3g3nd72 5 жыл бұрын
Glad to see ifixit is finally moving to 64-bit, it's about time!
@MoritzvonSchweinitz 5 жыл бұрын
Full NTP (not the light version sometimes used in some libraries) tries to measure and correct for network latency.
@ratchet1freak 5 жыл бұрын
even NTP lite can adjust for network latency, each ping has the 4 timestamps needed for it. (Assuming up is equal to down with regards to latency) Full NTP will do that **and** tries to filter out anomalies in the measured latencies.
@sogerc1 2 жыл бұрын
And if you use the NTP daemon, your clock will never jump backwards, the daemon will adjust the clock speed to slowly get in sync with the world. I had this problem once a long time ago, my mail server comitted suicide because my clock jumped backwards, I've been using the daemon since, it's very lightweight.
@mauritsjanssen7176 5 жыл бұрын
Atomic clocs are outdated, using pulsars (pulsating strar) you can measure the time way better (atomic clocks have an error of 10^-16 seconds while pulsars have an error of 10^-18 seconds).
@elon6131 5 жыл бұрын
Maurits Janssen well technically, atomic clocks ARE the second :)
@mauritsjanssen7176 5 жыл бұрын
@@elon6131 that's true, but they want to change it.
@lucashermann7262 5 жыл бұрын
Damn sounds cool tho that accuracy error is per year?
@mauritsjanssen7176 5 жыл бұрын
@@lucashermann7262 that is on how much decimals precies you can calculate te time of one puls of a pulsar.
@swvsvscwv5741 5 жыл бұрын
Yo mama is outdated.
@alexc3504 5 жыл бұрын
WE GET IT LINUS YOU'RE OLD. I'm 21 and I remember VCRs too. I still have one
@oscarosullivan4513 3 жыл бұрын
VCR?
@ViperStudiosAndy 5 жыл бұрын
That notch in the thumbnail is painful to look at
@brandon_nope 5 жыл бұрын
ViperStudiosAndy Those symbols are.
@JHA854 5 жыл бұрын
Welcome to 2018
@sammiller5509 5 жыл бұрын
Even the graphics are notched
@mjc0961 5 жыл бұрын
Every iPhone is painful to look at.
@cg85 5 жыл бұрын
Right
@rogepena1707 5 жыл бұрын
Very good video! I love this kind of content, it's what made me suscribe to your channel years ago
@rynieryarom4277 5 жыл бұрын
Who would thought an episode about time would make Linus feels old?
@decoy1312 3 жыл бұрын
Bet you feel old right now
@outsideredge 5 жыл бұрын
Level 1 of being your family's go-to IT guy is knowing how to set all the clocks after a power outage or daylight savings.
@sufration 5 жыл бұрын
Wonderful work .. Continue for the best .. With the best greetings.
@user-sb8cs3le2j 5 жыл бұрын
Thanks,helped me a lot
@JmSantos78 4 жыл бұрын
I remember not only setting up my family's VCR clock, I did it for some of the neighbors too. Also, programming TV's.
@oscarosullivan4513 3 жыл бұрын
Sounds fun
@joe_zupko 5 жыл бұрын
2:03 "yep, there's your problem right there, Jim"
@ModaTheYoda 5 жыл бұрын
I love these.
@ratchet1freak 5 жыл бұрын
The NTP time protocol (the protocol that is dedicated to getting time from atomic clocks) will actually try to adjust for network latency. Mostly by assuming up latency is equal to down latency.
@justingathright1670 5 жыл бұрын
👍!👍! Thanks for the knowledge & good job.
@stuartpratt3662 5 жыл бұрын
Linus I completely agree and boy oh boy those were the days but like the rest of the world I began to ignore the VCR clock as it was practically useless if you had a wall mounted clock or a watch
@something_001 5 жыл бұрын
imagine if the first thing aliens hear from us is an atomic clock broadcast
@hardware_geek8136 5 жыл бұрын
i hope tey dont think thats its an an countdown
@Dust599 5 жыл бұрын
The first things they will hear is a violent eruption of noise as we annihilate ourselves
@elik9448 5 жыл бұрын
@@hardware_geek8136 it's worth nothing that any civilization advanced enough to receive and decipher (amidst intergalactic noise + wave decay) would probably have their own atomic clocks, as well as some sort of broadcast system for them implemented at some point in their history.
@kakikencing8390 5 жыл бұрын
The first thing they will hear is Despacito
@oscarosullivan4513 3 жыл бұрын
The time is 13:17
@darwinbodero7872 5 жыл бұрын
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.
@ToniML200 5 жыл бұрын
0:42 "Let's talk about…" that notch.
@LMacNeill 5 жыл бұрын
I had a piece of software that I got back in the late '80s or early '90s that allowed you to dial in via modem to NIST servers directly. It would calculate the latency on the phone call and set the clock on your computer, plus the calculated latency, so it would be very close to the exact NIST atomic-clock time. Within a thousandth of a second, or so it claimed. Obviously such a piece of software would be obsolete today, but it was very cool back then to have it!
@ventilate4267 5 жыл бұрын
I never knew I needed to know this
@cgraham6 5 жыл бұрын
Even the old iPod I have sitting around still adjusted itself for daylight savings time last week, with it's wifi off. I have no idea what signal it was using, or maybe it just knew what date to fall back on.
@JamesRussoMillas 5 жыл бұрын
this channel is just awesome.
@fundemort 5 жыл бұрын
Dat doesn't answer my question why my samsung led TV plugged off for more than a year. And after I turned it on, it still shows an accurate date and time. No power, no battery, no wifi connection. How? Can anyone answer? Is there some sort of build-in small specialized clock-battery inside that can last for years?
@korolex441 5 жыл бұрын
There is a small battery on the board that keeps the time and settings.
@fundemort 5 жыл бұрын
@@korolex441 Thank you! Still quite amazed though it could last for years.
@abhyudaychakraborty3818 5 жыл бұрын
@@fundemort it's called CMOS
@jordanbarnsley2438 5 жыл бұрын
It works similarly to an atomic clock in the way it uses oscillations... Instead of bombarding an atom with loads of energy it measures the naturally occurring oscillations of a crystal when a voltage is applied across it... Thus the CMOS battery is all that is needed to keep this oscillator going.
@southernstalliongaming7544 5 жыл бұрын
The Nintendo Wii has a cmos battery and I’ve had one since the Wii’s launch and it still holds its time
@nikkikamstra1671 3 жыл бұрын
Like getting old with you linus
@mariocampos9887 5 жыл бұрын
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.
@Starfals 5 жыл бұрын
My laundry.. my microwave.. my alarm timer.. my clocks.. it all has to be done manually. Only my computer sets it up automatically. Grr. Most of my things are not cheap either... so i dont know.. its not really a history thing. It happens with me quite often.
@sterix_gg 5 жыл бұрын
Buy a "radio controlled" clock then
@oscarosullivan4513 3 жыл бұрын
Buy a radio clock
@100Thesniper 4 жыл бұрын
The concept of measuring time actually started in Greenwich London & is where the GMT time format originated....... also different countries measure their time as GMT+ hours but never GMT - hours
@woopygoman 5 жыл бұрын
Please make a video on focus stealing (in-browser and OS). This issue can be very irritating especially when typing up your paper or browsing very questionable websites. I think it deserves more attention. It's a very old GUI/UX problem that still hasn't been solved! It blows my mind how no one has managed to fix this really annoying problem.
@NicosLeben 5 жыл бұрын
"...when the NFL has finally given up on using roman numerals." I laughed so hard. :-D
@PierceMD 5 жыл бұрын
Thanks for the quickie .
@KuruGDI 5 жыл бұрын
1:23 _You're Getting Old_ is also an old South Park episode
@Jaymac720 3 жыл бұрын
My noise machine is also an alarm clock and it’s drift is ridiculous. It can be off by a couple minutes every 6 months or so. I don’t use it as an alarm clock so it doesn’t really matter, but it drives my OCD/perfectionism crazy
@Donnirononon 4 жыл бұрын
"Remeber when you had to re configure the clocks after a power outtage on your electronical devices? Now they have batteries, end."
@oscarosullivan4513 3 жыл бұрын
Home alone
@devinsmith3019 5 жыл бұрын
Next do why your PC's time settings are important for web security
@BuickGeek24 5 жыл бұрын
I know that on a computer that is on an active directory domain, if the time is incorrect, kerberos authentication can be thrown off
@Turskaify 5 жыл бұрын
Ah yes I remember waking up to the blinking 00:00 on the VCR player and knowing from that there was a power outage in the night
@oscarosullivan4513 3 жыл бұрын
Reset it
@PatPat08_71 5 жыл бұрын
I love techquickie
@nixdorfbrazil 5 жыл бұрын
Here in Brazil several phones went to daylight saving time one week earlier! Oops. But when I was in US I saw some "atomic" wall clocks that I guessed got their time from radio stations that transmitted the accurate time. I have was wondering if I bring some "atomic" clocks down here, if they would work at all. There's any wall clock that adjust their time to your wifi router or an international date and time service?
@tuckern.3534 5 жыл бұрын
Still a great episode
@user-co4xl7wx3q 5 жыл бұрын
That was a surprisingly interesting video
@MoViesDProductions 5 жыл бұрын
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.
@sudipchatterjee 5 жыл бұрын
".... poke and pry." That is totally Linus-y!
@zazraNL 5 жыл бұрын
Haven't been able to sync my windows pc's manually with an ntp for a while now. So not sure how true that still is... Win 7 & 10 both don't manually sync, they do still automagically switch DST though. On linux it works fine however, just hard to find a still working NTP due to the ddos issues with the protocol (unless that has been fixed by now)
@omaromarrr5566 5 жыл бұрын
I was wondering about this
@megaguidu35 5 жыл бұрын
Probably best tool to ad for
@alcopley7684 5 жыл бұрын
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.
@Minecraft101ToonLink 5 жыл бұрын
I figured that maybe smart devices get the time from what I like to call “Clockwork Servers” that is basically a server that keeps track of time and pushes the output to your smart device, but I suppose atomic clocks work, too. Well at least I got it mostly right.
@oscarosullivan4513 3 жыл бұрын
You did
@JuggernautProductions 5 жыл бұрын
I was listening to hear the mention of the CMOS battery in PC that maintains the time during no power/no internet, I guess not :/
@oppositecube 5 жыл бұрын
When you own the exact clock shown in the thumbnail at your house.
@oscarosullivan4513 3 жыл бұрын
So?
@juri14111996 5 жыл бұрын
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.
@TrabanT33 5 жыл бұрын
Can you please update your sub count in your intro?
@c0ntriL 5 жыл бұрын
If that really bugs you, that means they would have to update their sub count intro every other day.
@rzxv3 5 жыл бұрын
They should update it every month or year.
@TrabanT33 5 жыл бұрын
@@c0ntriL sure why not
@kaukon 5 жыл бұрын
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.)
@sonnypurwanto 5 жыл бұрын
But phones and PCs clocks work offline too. Some phones also can operate alarm when shut off. Is there any internal clock within the device?
@DjGabuza 5 жыл бұрын
I got a iFixit Pro Tech Toolkit. Its awesome.
@BharatKulkarnibb 5 жыл бұрын
I have dual booted my laptop with Windows 10 and Ubuntu 16.04 and whenever i go back to windows the time is not updated even though it's connected to internet and automatic time is set to on
@OldVamp 5 жыл бұрын
There was talk of shutting down the US Radio based time signals like WWVB recently.
@ItMistas 5 жыл бұрын
When linus shows a picture saying in the city you live in XD i had no idea he has been stalking me
@coffeeconcentrate 5 жыл бұрын
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.
@ocea3237 5 жыл бұрын
You should do a video about why we cant browse the internet if the PC's date is set wrong
@Bankai166 5 жыл бұрын
hi could u do how to pair an external wifi adapter to an enterprise network or etc?! as the wifi card in MAC always seem to fail ppl! :(
@jinfree0815 5 жыл бұрын
From Techquickie to Sciencequickie real quick!
@nigeljohnson9820 5 жыл бұрын
It might have been worth covering the protocols that compensate for network latency.
@IchHaba 5 жыл бұрын
Ok but how does a pc track time when switched off and disconnected from the Internet?
@JmSantos78 4 жыл бұрын
There's a battery in your motherboard. Look up CMOS battery. Fun fact: my laptop is so old the CMOS battery doesn't work anymore, so every time I unplug it, it goes back to 2007. :-)
@toby2636 4 жыл бұрын
Didn't Tape Players get the time from the electric frequency coming from the socket?
@oscarosullivan4513 3 жыл бұрын
Sounds interesting
@theonewhowatchesthewatchme2275 5 жыл бұрын
Ah the good old VHS (which we still use). And setting the time and record timer was the first thing i figured out.
@jamesjason8471 5 жыл бұрын
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?
@SpanishGrows 3 жыл бұрын
That South Park episode was sick haha happy 420
@needmorebeans 5 жыл бұрын
I'd love to see an episode on PaaS and IaaS!
@aryaman1906 5 жыл бұрын
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
@oscarosullivan4513 3 жыл бұрын
It re syncs
@jgoncrzy4176 3 жыл бұрын
I remember my school clocks (analog controlled by one master clock) being like 2-3 mins ahead of the time on my cellphone when cellphones first came out. Eventually the school went digital and the clocks reflected what my phone said. What I’m wondering is- did the schools conform to the pressures of our phones and set the time back a few minutes? Or had the schools always been off by that amount of time? I lived in a rural community.
@Luna_Potato 2 жыл бұрын
My school has digital clocks.. and they ‘re always 1-1.5 MINUTES off from what my phone says.. always screws me up when tryna figure out between periods how much time I have untill the bell rings.. and no i don’t live in a rural area
@aydenmudge279 5 жыл бұрын
these guys smart. make a time change video close to when there is an actually time change for most of America for the thousands of us who are having problems with our phones
@sjf21 5 жыл бұрын
It's really weird knowing that I live about 10 minutes from the official clocks of a whole country (NIST F1/F2).
@IzAKuLuS 5 жыл бұрын
I like how the phone has a notch in it. This is what tech has lead us to, NOTCHCITY
@joeldowell5059 5 жыл бұрын
You know what I learned from this video? Linus is old. (so am I... I remember resetting our VCR clocks)
@k2account38 4 жыл бұрын
It’s okay fetching time from somewhere But even with your PC not connected to internet by any means & with no gps, (& automatic date & time turned off), it still shows right time after being turned off for days. How it does that? Is there a clock running inside all time that’s powered by some small battery in the cpu that recharged every time you turn your computer on?? (My 2004 windows PC with no wifi, no Bluetooth, no GPS, [and we didn’t connect it to internet] used to do this) Somebody please explain., Thanks
@Coolio_Ash 4 жыл бұрын
i was just learning about this in my comptia a+ class
@_--____--______--___ 5 жыл бұрын
One small problem. My laptop doesn't adjust the time automatically and has to be set whenever the clocks change. It also has to be set manually when the mains cable has been unplugged for a few seconds because the battery is shot and needs replacing. It's actually not worth replacing the battery because the laptop is about 10 years old. I've looked at buying a new laptop, but I don't know if the ones on display in Currys PC World have been messed with, but they feel slow and unresponsive in comparison to my dinosaur running Windows 7 (the best version in existence).
@robertsnyder4963 5 жыл бұрын
Riddle me this: Why does my basic as hell radio alarm clock in my bedroom automatically spring forward/fall back for Daylight Savings Time, but in my '07 Charger with GPS navigation, I have to go into the settings menu to turn on/off Daylight Savings Time??? Also, it's a minor pet peeve of mine when you do have to reset the clocks in the house (stove,microwave, etc.) and they all end up being seconds off of each other when all is said and done 😠
@kallus87 5 жыл бұрын
Make a video how to choose correct SFP module as fast as possible
@keiichiiownsu12 4 жыл бұрын
I finally get why he was making all of those "old timer" jokes
@ChaotiX1 4 жыл бұрын
okay but how come every time i reset my computer the time it pulls is always an hour ahead or behind??
@DragoniaLegendary 5 жыл бұрын
1:17 He's talking about the boi on the Elizabeth Tower, brits.
@seanbrisson7928 5 жыл бұрын
Old but gold. never forget. never forgive.
@Yeeeeeehaw 5 жыл бұрын
Thanks
@ssd21345 5 жыл бұрын
2:25 isn't photon exciting is mostly related to physics, i.e quantum mechanics?
@safarikick 5 жыл бұрын
What do they do for leap year
@qwertyuiopzxcfgh 5 жыл бұрын
Back at our place nobody knew how to set the time on the VCR, so we just unplugged and plugged it back in at 12 am.
@EricssonB 5 жыл бұрын
But Linnus the gPS clocks in spaces are refernced to the big govnerment clocks on the ground.
@75ur15 5 жыл бұрын
No mention of the camos battery that keeps the PC clock going even without power
@btngana2077 5 жыл бұрын
MAGIC!!!
@matthewsibley8942 5 жыл бұрын
tbh the Ifixit stuff is fuckin' brilliant.
@jody.lumbantoruan 5 жыл бұрын
even when my laptop is offline and running out of battery, still can manage the time? can someone explain what is going on here?
@sbellaharris 5 жыл бұрын
My digital watch's time is still super accurate after 8 years! The battery is still good!
@oscarosullivan4513 3 жыл бұрын
Simple
@Myxolydia 5 жыл бұрын
hey could you guys make a vid on amdahl's law?
@BubblegumChewer 5 жыл бұрын
How do devices keep time even when fully switched off/disconnected from a power source?
@oscarosullivan4513 3 жыл бұрын
They re sync
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