I have noticed a problem with recurring events in dtcm.
I have created a weekly event "Séminaire" every Monday at 11am.
For the month of March, I notice that the event will start at 11am
except on March 14 and March 21 when it will start at 12am instead of
11am. (see the PNG in attachment)
For the month of October, on the 31, the event will start at 12am (see
second attachment).
The problem does not occur with dtcm_lookup, and I am running the latest
git version of CDE.
A partial explanation of the problem is that the DST starts earlier in
North America (March 13) than in Europe (March 27). It also ends earlier
in Europe (October 30) than in the US (November 6).
The anomaly thus occurs when North America will be on DST but not
Europe. This suggests that for a recurring event, an adjustment is made
when the initial event was created while DST was off and the current
event is taking place with DST on.
Without DST in Europe and North America, the event occurs at 10 UTC = 11
in Paris.
With DST in North America and in Europe, the event occurs at 10 + 2 -1 =
11.
With DST in North America, but not Europe, the event should occur at 10
+1 but instead occurs at 10 +2.
It is as if dtcm was using the North American rule to determine whether
DST is on or off, but used the European rule to decide whether
the extra hour must be substracted.
I have also found some problems with DST in dtcm have been previously
reported on Tru64 UNIX.
http://article.gmane.org/gmane.os.tru64.managers/3863
http://article.gmane.org/gmane.os.tru64.managers/3866
Edmond Orignac
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