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What time is it, on your computer?

Community Veteran
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Registered: 06-11-2007

What time is it, on your computer?

just a query, cos I checked the clock settings on mine, and to get "Internet time" you can choose from
time-windows.com
time-nist.gov
time-nw.nist.gov
time-a.nist.gov
time-b.nist.gov
so the query is.... what do they mean?  where are they, and are they all as good as each other, so it really doesn`t make any difference which one you choose...  ?
29 REPLIES
Community Veteran
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Registered: 10-04-2007

Re: What time is it, on your computer?

The best bet is to use a time server which is as close to you as possible. You can't get any closer than ntp.plus.net! (you don't have to pick from the list, you can put your own in)
jelv (a.k.a Spoon Whittler)
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Re: What time is it, on your computer?

I remember installing a local time server in a trading floor project in London, the company had office in the USA, Europe and Russia and their servers had to be absolutely in time synch. Using the internet ntp was not sufficiently accurate. Those systems picked up the GPS time signal and required an antenna wire running up several floors to the roof. The main problem was protecting the antenna and cable from lightning strikes which could have had a direct route into the server room.
Now Zen, but a +Net residue.
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Re: What time is it, on your computer?

I would think any one would be accurate enough for our needs Wink
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Re: What time is it, on your computer?

Quote from: spoon
The best bet is to use a time server which is as close to you as possible. You can't get any closer than ntp.plus.net! (you don't have to pick from the list, you can put your own in)


Smart answer... !   ... however.... how does someone like me....  and un-educated techno nerd.... (!) find out about this kind of stuff...   HUH  ?  easy for those who know, to answer, but not so easy for us "unknowing" plebs to find out....
I had no idea that PlusNet was a time station, nor the address, nor that I could put my own time station address in the box....  only a true "nerd" would know all that....   Cheesy Cheesy Cheesy
Hence my original question(s) .... Undecided
(late edit)...... Thanks Artmo !  Wink
Community Veteran
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Re: What time is it, on your computer?

Quote from: artmo
I would think any one would be accurate enough for our needs Wink

True. One thing I do do is use the same source for all devices.
jelv (a.k.a Spoon Whittler)
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Re: What time is it, on your computer?

They are supposed to be accurate to milliseconds.
I hope Plusnet keep their atomic clock wound regularly.
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Steve
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Re: What time is it, on your computer?

I just looked at the time on my pc all it says is ' bedtime '
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Re: What time is it, on your computer?

Quote from: shutter
so the query is.... what do they mean?   where are they, and are they all as good as each other, so it really doesn`t make any difference which one you choose...  ?

They're domains / addresses for NTP servers - in other words time servers which use the NTP protocol.
Many are american but there are others out there - they normally send you the time in your timezone automatically - presumably this is sent in the request like most other protocols requesting information.
I have a list of servers if its any use to you.. I know tick and tock.usno.navy.mil both went offline a while back, no idea if they're back online or what others are still valid but here we go:
augean.eleceng.adelaide.edu.au
bonehed.lcs.mit.edu
calvus.rzs-hm.si
chronos1.umt.edu
chronos2.umt.edu
chronos3.umt.edu
clock.cuhk.edu.hk
clock.isc.org
clock.linuxshell.net
clock.nc.fukuoka-u.ac.jp
clock.psu.edu
clock.tl.fukuoka-u.ac.jp
clock2.netcetera.dk
cuckoo.nevada.edu
darkcity.cerias.purdue.edu
fartein.ifi.uio.no
fuzz.psc.edu
gilbreth.ecn.purdue.edu
gps.freebsd.dk
harbor.ecn.purdue.edu
info.cyf-kr.edu.pl
louie.udel.edu
molecule.ecn.purdue.edu
navobs1.wustl.edu
nist1.aol-ca.truetime.com
now.okstate.edu
ns.nts.umn.edu
nss.nts.umn.edu
ntp.adelaide.edu.au
ntp.certum.pl
ntp.cmr.gov
ntp.cpsc.ucalgary.ca
ntp.cs.strath.ac.uk
ntp.cs.unp.ac.za
ntp.ctr.columbia.edu
ntp.dgf.uchile.cl
ntp.fnbhs.com
ntp.karpo.cz
ntp.lth.se
ntp.marine.csiro.au
ntp.maths.tcd.ie
ntp.mel.nml.csiro.au
ntp.nml.csiro.au
ntp.obspm.fr
ntp.per.nml.csiro.au
ntp.psn.ru
ntp.saard.net
ntp.shim.org
ntp.tmc.edu
ntp.ucsd.edu
ntp.univ-lyon1.fr
ntp.via.ecp.fr
ntp0.cornell.edu
ntp-0.cso.uiuc.edu
ntp0.nl.net
ntp1.cmc.ec.gc.ca
ntp1.cs.wisc.edu
ntp-1.cso.uiuc.edu
ntp-1.ece.cmu.edu
ntp1.fau.de
ntp1.mainecoon.com
ntp-1.mcs.anl.gov
ntp1.mpis.net
ntp1.nl.net
ntp1.sp.se
ntp-1.vt.edu
ntp2.cmc.ec.gc.ca
ntp-2.cso.uiuc.edu
ntp-2.ece.cmu.edu
ntp2.mainecoon.com
ntp-2.mcs.anl.gov
ntp2.mpis.net
ntp2.nl.net
ntp2.sp.se
ntp-2.vt.edu
ntp2a.mcc.ac.uk
ntp2b.mcc.ac.uk
ntp2c.mcc.ac.uk
ntp2d.mcc.ac.uk
ntp3.cs.wisc.edu
ntp5.tamu.edu
ntp-cup.external.hp.com
ntps.net4u.it
ntps1-0.cs.tu-berlin.de
ntps1-1.cs.tu-berlin.de
ntp-sop.inria.fr
os.ntp.carnet.hr
otc1.psu.edu
ptbtime1.ptb.de
ptbtime2.ptb.de
reloj.kjsl.com
ri.ntp.carnet.hr
rolex.usg.edu
sizif.mf.uni-lj.si
st.ntp.carnet.hr
sundial.columbia.edu
sushi.compsci.lyon.edu
swisstime.ethz.ch
tick.cs.unlv.edu
tick.keso.fi
tick.nap.com.ar
tick.usno.navy.mil
tick.utoronto.ca
time.alcanet.no
time.chu.nrc.ca
time.deakin.edu.au
time.esec.com.au
time.ien.it
time.ijs.si
time.kfki.hu
time.nrc.ca
time.nuri.net
time.sinectis.com.ar
time1.stupi.se
time2.stupi.se
timekeeper.isi.edu
timelord.uregina.ca
timeserver.cs.umb.edu
timex.cs.columbia.edu
timex.usg.edu
tock.keso.fi
tock.nap.com.ar
tock.usno.navy.mil
tock.utoronto.ca
usno.pa-x.dec.com
vega.cbk.poznan.pl
wwv.otc.psu.edu
zg1.ntp.carnet.hr
zg2.ntp.carnet.hr
I need a new signature... i'm bored of the old one!
Community Veteran
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Re: What time is it, on your computer?

I've been using ntp2d.mcc.ac.uk for a number of years now, proper full-fat british time, none of that watered-down Microsoft time for me thanks... Grin
VileReynard
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Re: What time is it, on your computer?

Clocks are accurate to better than microseconds.
Distance is no problem as NTP (on Linux anyway) automatically compensates for time delays in contacting the time servers.
e.g.
Quote
~ $ ntpq -pn
    remote          refid      st t when poll reach  delay  offset  jitter
==============================================================================
*212.159.13.49  195.66.241.10    2 u  579 1024  377  11.533  -1.009  0.481
+46.4.54.78      36.224.68.195    2 u  905 1024  305  29.226  -1.335  1.121
-62.210.85.244  138.96.64.10    2 u  928 1024  317  29.871  -6.104  1.544
-195.138.69.242  195.138.80.34    3 u  391 1024  377  62.604    0.383  5.029
+217.77.132.1    193.79.237.14    2 u  204 1024  233  19.432  -3.434  2.221

Community Veteran
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Registered: 16-02-2009

Re: What time is it, on your computer?

@Shutter the thing is YOU don't really need to know what a time server is, it is automatically set for you by M$, personally I have mine set to ntp.plus.net (I used to use ntp.demon.co.uk until I pinged the PN one to see if it was there). It is just a background service not something you can actively modify, in that once it gets the time set it is done (usually for then next 24 hours). If the time is wrong then probably it can't contact the time server.
VileReynard
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Re: What time is it, on your computer?

The NTP protocol contacts at least 3 different time servers - typically every 1,000 seconds or so.
It has a clever algorithm to find out what the "real" time is.

Community Veteran
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Re: What time is it, on your computer?

My wind up clocks time server is me.
I correct it to the nearest minute every few days.
Try as I might I've found no need or use to know the time to micro seconds.
Community Veteran
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Re: What time is it, on your computer?

I have used pool.ntp.org for many years and anything I have that allows me to make this setting I change to this. It's good when you see your PC, VoIP phone etc update at the same time.
However, a lot of devices suffer from drift so you have to ensure that you poll the time server often enough to compensate for this and keep everything in sync.