Why does Official internet time change?

Thread: Why does Official internet time change?

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  1. #1
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    Why does Official internet time change?

    I like to set my digital to the official time, and then use my digital watch to set my other watches.

    I use time.gov. Last night, I noticed that my digi-watch was about 10 seconds ahead. I left my watch alone. Then today, I visited 3 websites (usa, canada, gmt), and they all had the time time. This time I was 5 seconds ahead.

    Can anyone explain why the time is so different?

  2. #2
    Member MJK737's Avatar
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    Re: Why does Official internet time change?

    I'm not sure, but I use the USNO master clock, Then at work I'm able to check the time off GPS satellites. They both to seem to be synchronized.

    Go Navy!

    MJK

  3. #3
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    Fyi

    Quote Originally Posted by MJK737 View Post
    I'm not sure, but I use the USNO master clock, Then at work I'm able to check the time off GPS satellites. They both to seem to be synchronized.

    Go Navy!

    MJK
    GPS is @ 15 seconds ahead of UTC. e

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  5. #4
    Member nimravus01's Avatar
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    Re: Why does Official internet time change?

    I also use USNO master clock. http://tycho.usno.navy.mil/simpletime.html

    I have noticed that my computer's internal clock, after a few days, runs slow compared to the USNO clock, but, when I sync it to time.windows.com it matches perfectly. Although my cell phone doesn't display seconds, it seems to be within a half-second of the USNO clock. Been thinking about getting an atomic clock, but, not sure if a few seconds is worth stressing over.

  6. #5
    Member Rigel's Avatar
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    Re: Why does Official internet time change?

    There must be something wrong with your digital watch. I always check the time from time.gov and from my GPS almost everyday (yeah, I'm obsessed..). There is no contoversy about official time nowadays. The two systems, NIST/USNO and GPS (DOD) keep slightly different time, but never more than a few seconds at most.

  7. #6
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    Re: Why does Official internet time change?

    Quote Originally Posted by Rigel View Post
    There must be something wrong with your digital watch. I always check the time from time.gov and from my GPS almost everyday (yeah, I'm obsessed..). There is no contoversy about official time nowadays. The two systems, NIST/USNO and GPS (DOD) keep slightly different time, but never more than a few seconds at most.
    Nothing's wrong my digi. Like I said, I use it to calibrate all my watches and my cameras. When I check the internet time, ALL my watches and cameras are OFF by the same amount of time. Mind you, this is just the next day.

  8. #7
    Member MJK737's Avatar
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    Re: Fyi

    Quote Originally Posted by enough View Post
    GPS is @ 15 seconds ahead of UTC. e
    enough:

    Where did you get that information? At work we use a Flight Management System(FMS) which gets its navigation information from GPS (satellites).
    Every time I check my watch off the GPS it's pretty much bang on. There's no way that each FMS is 15 sec off. I'm not at all saying your wrong I just don't know what I'm missing. I would think the FMS and Air Traffic Control would have to be synchronized with the Official GMT to meet waypoint crossing restrictions, altitude restrictions, holding restrictions etc. Any avionics guru's or engineers please chime in.

    Or as Freddy would say, "Ok gang we've got a mystery to solve!"

    V/R

    MJK

  9. #8
    Member gadgetfreak's Avatar
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    Re: Why does Official internet time change?

    I noticed time.windows.com server which my computers syncs to was off by 10 secs aswell.
    I changed my computer to sync with time.nist.gov and now it's back in sync with my Atomic Radio sync watches.
    Casio EQW-M1000DB-1AER Solar Atomic Radio Sync 1/20th second Stopwatch
    Citizen 8110A Automatic 2-register flyback chronograph 28,800bph
    Casio PAW 1500T Titanium ABC Tide MoonGraph Radio Sync
    Citizen Calibre 2100 Titanium Chronograph AV0021-52H
    Invicta Corduba 7135 Skeletonized Miyota 8N24 21J Movt
    Invicta Sapphire Ghost Skeletonized ETA 2824-2 Model 2701
    Citizen Promaster Titanium AS4050-51E Radio Control Eco-Drive (Ultimate Nighthawk) **GRAIL STATUS**
    Invicta SubAqua Noma III 4550 ETA 7751 **GRAIL STATUS**
    Citizen Skyhawk AT Black Stainless Steel **GRAIL STATUS**
    Citizen Skyhawk Stainless Steel
    Casio G-Shock GW-1300A Solar Atomic
    Casio Protrek PRG-70YT Black Titanium Triple Sensor
    Casio SeaPathfinder SPF-70T Titanium Triple Sensor
    Casio Protrek PRG-80T Titanium Triple Sensor
    Poljot 31681 Movt Volmax Aviator III Mechanical Chronograph
    Aviator 31681 / 3035268 Mechanical Chronograph

  10. #9
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    Re: Why does Official internet time change?

    time.gov seems to be good for me, and it's always in sync with my cell phone too.

  11. #10
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    "You can't handle the truth!"

    Quote Originally Posted by MJK737 View Post
    I'm not at all saying your wrong I just don't know what I'm missing. MJK
    Simple. GPS is based on Cesium decay, starting back in about 1980. UTC is based on astronomical, adjusted. There's more. Loran time is 9 seconds ahead of GPS. And TAI is SI based and 34 seconds ahead of UTC.

    e

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