Re: DST bug in touch utility

[Eric Blake]

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According to Bob Proulx on 12/3/2009 10:15 PM:
> Cesar Mugnatto wrote:
>> When using:
>> touch.exe -c -t 200910030001 "filename.ext"
>> (or for that matter, any date that falls within Daylight Saving
>> Time) and the date on which the touch command was issued is in
>> Standard Time (for example today's date Dec. 3, 2009), the file
>> "filename.ext" is touched with an incorrect date.
> 
> Thank you for your bug report.  I can see by your filename touch.exe
> that you are not using a native version of GNU touch but one of the
> ports from GNU to MS.  What port are you using?  What is the version
> of it?  What timezone are you using?

More importantly, what filesystem are you using?  Microsoft's
implementation of FAT is notoriously limited in that it stores a local
timestamps based on the timezone that was in effect when the timestamp was
written, and reads timestamps back according to the timezone in effect
during the read.  As a result, you are VERY prone to seeing these
mysterious one hour jumps in timestamps on files stored on FAT.  You get
much more consistent results when using a better filesystem, like NTFS,
where timestamps are stored relative to UTC rather than as a local timestamp.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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