[Info-vax] Time change

[AEF]

On Mar 9, 5:30 pm, "Richard B. Gilbert" <rgilber... at comcast.net>
wrote:
> Michael Moroney wrote:
> > JF Mezei <jfmezei.spam... at vaxination.ca> writes:
>
> >> How is this implemented in alpha ? Does the system do a glorified
> >> SYS$SETTIM to call a routine to execute at the next scheduled time
> >> change ?  or is there some other type of mechanism that allows VMS to
> >> schedule some event in the long term ?
>
> >> Also, if I have an alpha that was shutdown during this time, when it
> >> next boots, will it automatically change its time ?
>
> > I had to deal with this during the last time change, to try to prevent
> > the setback from happening automatically with software that really
> > couldn't deal with it.
>
> > (the following is true only if SYSGEN AUTO_DLIGHT_SAV is set to 1, and
> > things like NTP time synch aren't enabled. What's the setting on your
> > VAX?)
>
> > The JOB_CONTROL process has a $SETIMR scheduled to expire at the time of
> > the time change, and when it does, JOB_CONTROL sets the time according to
> > the time zone rules.  It reads the info in when it starts up, and it has
> > enough smarts to set the time right then if the time change happened when
> > the system was down.
>
> > $ ANALYZE/SYSTEM
> > SDA> SET PROCESS/IND=E   !JOB_CONTROL
> > SDA> SHOW TQE
> > Timer queue entries
> > -------------------
>
> >   TQE                                                             PID/
> > address                 Expiration Time                 Type    routine
> > --------   -----------------------------------------   ------   --------
> > ...
> > 880EA380   00A93E1F.7B714530  1-NOV-2009 02:00:00.00   TSA---   0001000E   JOB_CONTROL
> > SDA>
>
> > Next time change will take place Nov 1 at 2:00 AM.
>
> > You may notice that $SETIMR can schedule events to happen thousands of
> > years in the future, if you can manage to keep your system up that long.
>
> > Aside: Were you guys in Canada supposed to change your time this last
> > weekend?  The date of the time change was recently changed.
>
> It's politics as usual.  Changing the date of the time change is a
> highly visible means for the politicians to show the people that they
> are actually doing something!  ;-)

Well, the recent fall-back change in the US was made because of the
Halloween lobby. I don't know what moved the spring-ahead up, though.
Might have to do with saving energy.

AEF