I was using bios UTC time for years now (not dual booting), I've ignored till
now that Linux is not able to manage DST changes using bios localtime and that it is posible set UTC in Windows. I've found the windows registry entry you mention here: https://wiki.archlinux.org/index.php...UTC_in_Windows Good to know that. Thanks Martinus2u! |
Ufff, dual booting, the first thing that occurred to Patrick, was responsible. Or rather my not choosing the proper timezone in Windows together with the fact that Windows was set to adjust time based on internet sources. My timezone (Windows) was Central Time (-6.00) when in fact mine is -3.00. That's why my clock led by exactly 3 hours!
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Central Time is US Central (i.e. Texas):
Code:
$ TZ=US/Central date ; TZ=America/Argentina/Buenos_Aires date |
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The three-character abbreviations are the time zone; in the conterminous US, there is Eastern, Central, Mountain and Pacific, there is Standard time and Daylight time and there is Time: thus, EST, CST, MST and PST during "normal" months and EDT, CDT, MDT and PDT during "daylight savings" months (Alaska and Hawaii are far west of those zones, they abbreviate as AKST and HAST).
The ART is simply the country code (AR) and Time (seems like Argentine only has one time zone?). "Wide" countries have multiple time zone and the three- or more character codes are just a way to keep things on track. The basic rule is that every 10 degrees east or west of Greenwich is one hour; that's not political, it's physical. The way the time zone are carved out, though, is political (look at a world time zone map and you'll see that -- no straight lines there). This one is kind of cute: http://www.timeanddate.com/time/map/. There are places on the planet where some time zones are in half-hours (gotta wonder about that). And all along, Windows had your clock screwed up. Oh, well. Hope this helps some. |
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Argentina has two different times since some years now. And since about the same time we do not have daylight time. But should not the fact that we use standard time be reflected in 'ART', and be 'ARST'?
A remark that comes to my mind is, why so few man pages speak about the format of the command output? Example, 'date'. |
stf92,
Try the opposite settings than suggested by eloi in post #11. The Linux thing I don’t bother too much with the time settings in BIOS. When I run timeconfig I choose the option „Hardware clock is set to UTC” and I set the right time zone („Europe/Warsaw” in my case though „Europe/Paris” does the same – sets the time to the Central European one). Then I use date command to set the right date and time. Finally I run hwclock --systohc command to write the right time to BIOS. In /etc/rc.d/rc.local_shutdown I set the same command: Code:
# save time Code:
# adjust time I don’t bother with --utc and --localtime switches because hwclock recognizes the valid settings using /etc/hardwareclock file. The Windows thing When you use dual booting with Linux and Windows the latter system spoils the time at the turn from the summer to winter and from the winter to summer (Widows makes the correction already made by Linux). To disable that find in Windows the time settings and switch off the correction for the summer/winter time. The time thing To check the right time in the different time zones use the following site: http://www.timeanddate.com/library/a...ons/timezones/ The date thing Quote:
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I'm not quite done with this problem it seems, and for the moment I made this: Went to windows and disabled the network thing, leaving daylight disabled too. Now I'm waiting to have stable symptoms before I take any measure.
As to your advices, I'll try them later, not now as I have said. The saving of system time to the hw clock at shutdown, I think the OS does it by default, but I'll have an eye on it. "What’s missing in the man date in your opinion?": Maybe I should know the meaning of ART but could not the manual say a word about the way the output specifies the country code and daylight condition? |
stf92
The date command reports the time zone (“CET” in the following example). date Code:
Sat Mar 9 19:30:00 CET 2013 To display the time and the date in the different time zones use my script: time+date Code:
#!/bin/bash time+date America/Buenos_Aires Code:
ART 15:30 03-09 time+date America/Buenos_Aires -l Code:
CET 19:30 03-09 Avoid time zones abbreviations because they are sometimes ambiguous and – as a result – display invalid values: time+date ART Code:
ART 18:30 03-09 zdump -v ART Code:
ART Fri Dec 13 20:45:52 1901 UTC = Fri Dec 13 20:45:52 1901 ART isdst=0 gmtoff=0 zdump -v America/Buenos_Aires Code:
America/Buenos_Aires Fri Dec 13 20:45:52 1901 UTC = Fri Dec 13 16:29:04 1901 CMT isdst=0 gmtoff=-15408 |
Quote:
Which, taken at the flood, leads on to fortune; Omitted, all the voyage of their life Is bound in shallows and in miseries. On such a full sea are we now afloat, And we must take the current when it serves, Or lose our ventures. (William Shakespeare, Julius Caesar) |
I do not want to look at the book now, but that must refer to Casius, or Casius trying to convince Brutus. Anything to do with the thread? Oh, now I got it!
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time+date America/Buenos_Aires -l Code:
CET 20:05 03-09 |
Very good.
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