hi & thanks anyone yes, in the past I had to accomodate for dual booting into that peculiar other operating system (hereby called Windows, as by Santiago suggestion) : I developed gtkmorph in the past, and it had to run on both O.S.es ; but nowadays I dont, so I think I will switch my RTC to UTC, and be done with it.
The reason why I did send the first post is that I thought there may be a way to do daylight switching even when RTC!=UTC ... but thinking about it more, I decided it is almost impossible: when dual booting, the RTC is affected by both O.S.es, so it all would depend on which one of the O.S.es is booted first on daylight-switching-day : the only way is, possibly , that Debian should peek into the innards of the Windows registry, to see if daylight-switching was already done, or not, on the RTC... this seems too complex to be feasible (I for once could not do it) a.
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