date-time changing after reboot

[Vasilis Vasaitis]

On Wed, Nov 10, 1999 at 09:37:37AM +0200, Michalis Kabrianis wrote:
> 
> On 09-Nov-99 Vagelis Papadogiannakis wrote:
> > Xmmm, proseksa oti ex8es eixa allaksei tin ora (pigaina 12 ores piso)
> > alla simera ksanagirise stin palia (to eida apo to date pou eixe ena
> > posting mou). Gia tin akribeia ekana:
> > 
> > ---cut---
> > [vagos at vagos ~]$ date
> > Tue Nov  9 08:48:39 EET 1999
> > [vagos at vagos ~]$ su
> > Password:
> > [root at vagos /home/vagos]# date 11092049
> > Tue Nov  9 20:49:00 EET 1999
> > [root at vagos /home/vagos]# date
> > Tue Nov  9 20:49:02 EET 1999
> > [root at vagos /home/vagos]# 
> > ---cut---
> > (oi parapano grammes einai oi simerines)
> > 
> > Otan ksanakana boot, tin eixe kanei opos palia (12 ores piso)
> > Kano kati la8os??? kai TI?
> > 
> > -=VAGELIS=-
> 
> 
> Yeap, kaneis (peripou) lathos. Peirazeis tin wra tou systimatos kai oxi tou
> hardware (bios). Dwse tou KAI ena "hwclock --systohc" kai eisai etoimos.
> Episis, bale se ena script (yang, kai gia sena ayto), otan ksekinaei o pppd na
> sou kanei synchronize opws eipe o Swtiris (netdate clock.auth.gr)
> 
> Michalis Kabrianis

  Στην πραγματικότητα, δεν θέλετε να αλλάζετε την ώρα μέσα από ένα σύστημα
που τρέχει, καθώς σε μερικά προγράμματα που εκτελούνται εκείνη την ώρα δεν
θα φανεί και πολύ καλό αυτό το χρονικό «άλμα». Βέβαια, αυτό διορθώνεται, αν
χρησιμοποιηθεί γι' αυτό το σκοπό η adjtimex(8). Αλλά και πάλι, θα υπάρχει
πρόβλημα με την προσαρμογή του ρολογιού του BIOS. Όπως λέει και το manpage
του hwclock(8):

       It is important that the System Time not have any  discon­
       tinuities  such  as  would happen if you used the date(1L)
       program to set it while the system is running.   You  can,
       however,  do whatever you want to the Hardware Clock while
       the system is running, and the next time Linux starts  up,
       it  will  do  so  with the adjusted time from the Hardware
       Clock.  You  can  also  use  the  program  adjtimex(8)  to
       smoothly adjust the System Time while the system runs.


-- 
Vasilis Vasaitis
vvas at hal.csd.auth.gr

Nuke them till they glow, then shoot them in the dark.


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