[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Possible nasty bug in time management (Issue #602)

[David T. Lewis]

Hi Nicola,

Actually this is an issue that must be handled in the image.
If you look at DateAndTime now in Squeak (any recent image)
you can see that it uses primitiveUtcWithOffset to obtain the
current time (UTC) and timezone offset, so Squeak is able to
follow the daylight savings time transition correctly. Cuis is
using a different implementation of DateAndTime based on an
older Squeak version, and that is the source of the issue you
are seeing.

Dave


On Wed, Nov 03, 2021 at 09:05:11AM -0700, Dr. Nicola Mingotti wrote:
>  
> Hi guys,
> 
> I found this bug running Cuis on my servers. I reported to the Cuis mailing list and after reply by Gerald Klix I guess this is the most appropriate place to tell it. I copy the same message i wrote on morning of 03-Nov-2021 in the hope you will be able to fix it. Unfortunately i can't help you, VM is still too much an unknown territory for me. 
> 
> =============== Original mail to cuis mailing list descriving the problem ====================
> I report you what i discovered this morning.
> 
> . I have 2 services running in Cuis in 2 independent Linux/Debian servers.
> 
> . In the weekend in Italy we changed time from CEST to CET
> 
> . The OSes changed time correctly
> 
> . But Cuis services are 1 hour forward !?!?
> 
> . If i run a fresh new Cuis now in my laptop (Linux/debian vm), I see it has the correct time, corresponding to the OS time
> 
> . I did not change my localTimeZone in Cuis, in any machine. It is acceptable for me it says UTC
>   even if it is actually localtime.
> 
> . Seeing 'DateAndTime now' I discovered that Cuis by default uses primLocalMicrosecondClock, so it should
>   always use the OS local clock and think it is in the UTC timezone. But, it is not doing
>   so on images that were started some days ago (max 20). It does so on new run images.
> 
> I don't know well how to fix this. Maybe some time config is made when Cuis starts up?
> It seems it is remembering the time when it was stared.
> 
> =============================================================================
> 
> 
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> https://github.com/OpenSmalltalk/opensmalltalk-vm/issues/602