Re: [7.3 VAX] NTP and daylight saving time

On 10/29/2024 9:19 AM, JKB wrote:

My VAX runs OpenVMS 7.3 and I uave configured NTP client some
months ago.
  Today, I have seen that clock was not synchronized. SHOW TIME
returns a difference greater than 4 hours between OVMS client and
NetBSD server.
  I have restarted NTP.
 $ type TCPIP$NTP_RUN.LOG
29 Oct 08:57:13  ntpd version = 4.1.0
29 Oct 08:57:14  precision = 10000 usec
29 Oct 08:57:16  drift file 'SYS$SPECIFIC:[TCPIP$NTP]TCPIP$NTP.DRIFT' does not e
xist: no such file or directory
29 Oct 08:57:17  will attempt to create drift file
29 Oct 09:01:41  time correction of 3607 seconds exceeds sanity limit (1000); se
$ show time
   29-OCT-2024 14:15:21
  On server side :
hilbert:[~] > date
mar. 29 oct. 2024 14:15:34 CET
  I have checked timezone with @SYS$MANAGER:UTC$TIME_SETUP.COM and, for
me, configuration correspond to Europe/Paris time.
  Server use UTC. For me, client use UTC also and only SHOW TIME does
time conversion from UTC to local time. I suppose I have done a
mistake somewhere, but where ?

"3607 seconds" is likely clock 7 seconds off and time zone 1 hour off.
Has it always been like this or did it happen when Europe switched
to winter time in the weekend?
I suspect that the TZ config may have CET/MET without DST
instead of CET/MET with DST with a wrong clock that gave the correct
result on summer time and and wrong result on winter time. But that
is pure speculation.
Arne