I have Stellarium (0.15.0) using system date and time and no timezone plugin. So I assuem also the timezone of my system is used.
If I have date 2016/6/21 the timezone is correct UTC+01:00 (I am in Ireland which is BST which is UTC+01:00 in summer time)
If I change the year into 1969/6/21 (or any year before that), the timezone is changed to UTC+00:00? Why is that? If I go to 1970/6/21 it is back to what it should be: UTC+01:00.
I would expect that the timexone (and summertime) setting don't change regardless of the date/time. Do I do something wrong? Thanks.
All the best,
Victor
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But I understand you point. The problem is that I ticked 'system date and
time', so I assumed it would use the present system and time method. But
perhaps it is similar to what you do around Julian and Gregorian calendar?
Perhaps adding the calendar type (J or G) and the time zone anywhere where
these two are mentioned, could help. So this is a UI issue;-).
Matters are more complicated, see https://en.wikipedia.org/wiki/Daylight_saving_time_by_country. I had always assumed it depends on national timezone rules (which is why we have so many "Europe/<capital>" timezones, see https://en.wikipedia.org/wiki/Tz_database), but indeed it seems to simply start in 1970 in Stellarium. I don't know whether this may come from Qt or own implementation, I have not looked into that area of code yet. It seems there is room for improvement for a certain user group... :-) Volunteers, go ahead and fix that!</capital>
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I have Stellarium (0.15.0) using system date and time and no timezone plugin. So I assuem also the timezone of my system is used.
If I have date 2016/6/21 the timezone is correct UTC+01:00 (I am in Ireland which is BST which is UTC+01:00 in summer time)
If I change the year into 1969/6/21 (or any year before that), the timezone is changed to UTC+00:00? Why is that? If I go to 1970/6/21 it is back to what it should be: UTC+01:00.
I would expect that the timexone (and summertime) setting don't change regardless of the date/time. Do I do something wrong? Thanks.
All the best,
Victor
Well, time zone rules include validity rules for DST. When was DST introduced in Ireland?
I think it is in 1971 for whole Europe:
http://www.irishstatutebook.ie/eli/1971/act/17/enacted/en/print
But I understand you point. The problem is that I ticked 'system date and
time', so I assumed it would use the present system and time method. But
perhaps it is similar to what you do around Julian and Gregorian calendar?
Perhaps adding the calendar type (J or G) and the time zone anywhere where
these two are mentioned, could help. So this is a UI issue;-).
All the best,
Victor
On 21 October 2016 at 11:48, gzotti gzotti@users.sf.net wrote:
Matters are more complicated, see https://en.wikipedia.org/wiki/Daylight_saving_time_by_country. I had always assumed it depends on national timezone rules (which is why we have so many "Europe/<capital>" timezones, see https://en.wikipedia.org/wiki/Tz_database), but indeed it seems to simply start in 1970 in Stellarium. I don't know whether this may come from Qt or own implementation, I have not looked into that area of code yet. It seems there is room for improvement for a certain user group... :-) Volunteers, go ahead and fix that!</capital>