Hi,

On 28/03/17 10:37, Andreas Tille wrote:
> tags 858260 help
> thanks
> 
> Hi,
> 
> I admit that when reading the bug report I have no idea how to fix it.
> I can confirm that I can reproduce the issue in a recent unstable
> chroot.  I have added maintainers of tzdata, Debian Science and Debian
> mentors in CC - just hoping for any helpful hint.

Whatever has happened, tzdata 2017a triggered it.

tzdata 2016j-2:
> $ python3 -c "import datetime, pytz; print(repr(datetime.datetime(2011, 1, 1, 
> tzinfo = pytz.timezone('Asia/Tokyo'))))"
> datetime.datetime(2011, 1, 1, 0, 0, tzinfo=<DstTzInfo 'Asia/Tokyo' 
> JST+9:00:00 STD>)

tzdata 2017a-1:
> $ python3 -c "import datetime, pytz; print(repr(datetime.datetime(2011, 1, 1, 
> tzinfo = pytz.timezone('Asia/Tokyo'))))"
> datetime.datetime(2011, 1, 1, 0, 0, tzinfo=<DstTzInfo 'Asia/Tokyo' 
> LMT+9:19:00 STD>)

There was a Asia/Tokyo change in tzdata 2017a, but I don't really know
how it caused this:

@@ -1462,8 +1452,6 @@

 # Zone NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone   Asia/Tokyo      9:18:59 -       LMT     1887 Dec 31 15:00u
-                       9:00    -       JST     1896 Jan  1
-                       9:00    -       JCST    1937 Oct  1
                        9:00    Japan   J%sT
 # Since 1938, all Japanese possessions have been like Asia/Tokyo.

Maybe it's a bug in python-tz?

James

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