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Thread: auto sync time

  1. #1
    Join Date
    Jan 2013
    Beans
    62

    Question auto sync time

    Hi all,

    how do I set auto sync time on logon?

    The question is I can not use cron, because this PC is not turned on all the time.
    Also system should wait untill wi-fi connection is established and only then start sync time.
    It should not just try sync and return error if wi-fi connection is not available yet.
    Someone help pls ?

  2. #2
    Join Date
    Jan 2010
    Location
    Kolkata India
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: auto sync time

    Quote Originally Posted by marchelloUA View Post
    Hi all,

    how do I set auto sync time on logon?

    The question is I can not use cron, because this PC is not turned on all the time.
    Also system should wait untill wi-fi connection is established and only then start sync time.
    It should not just try sync and return error if wi-fi connection is not available yet.
    Someone help pls ?
    If your system does not have a 100% uptime, you can use anacron.
    http://en.wikipedia.org/wiki/Anacron
    “Progress is made by lazy men looking for easier ways to do things”
    — Robert A. Heinlein

  3. #3
    Join Date
    Jan 2013
    Beans
    62

    Re: auto sync time

    codemaniac,
    thanks, I'll try it at home.

    Below is quick note for myself:
    sudo apt-get install anacron
    http://www.interphero.com/

  4. #4
    Join Date
    Mar 2010
    Location
    Metro-ATL; PM free zone.
    Beans
    Hidden!
    Distro
    Lubuntu 14.04 Trusty Tahr

    Re: auto sync time

    Quote Originally Posted by marchelloUA View Post
    Hi all,

    how do I set auto sync time on logon?

    The question is I can not use cron, because this PC is not turned on all the time.
    Also system should wait untill wi-fi connection is established and only then start sync time.
    It should not just try sync and return error if wi-fi connection is not available yet.
    Someone help pls ?
    a) Most people use NTP for time management. It has worked for 20+ yrs, but your CMOS needs to maintain the clock while the PC is powered off. It is extremely accurate when connected to the internet, but if the PC clock is too far off, it will take a long time to become accurate. There are limits to prevent NTP from changing the clock too much - it wants smooth changes.

    b) rdate is an NTP-like change the time NOW solution. You could script it to see if on the internet (does ping google.com work?), if not set the script to run again in 5 minutes using at (part of cron) after login.

    I've been using NTP for a very long time and never had any issues begin connected or disconnected. Also, setting the system time/CMOS to use UTC, not your local timezone is recommended too.

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