[tz] error in zone America/Kentucky/Louisville 1946

[Alois Treindl]

I have to report an error in zone America/Kentucky/Louisville

zdump gives
zdump -V -c 1945,1950 America/Kentucky/Louisville
America/Kentucky/Louisville  Tue Aug 14 22:59:59 1945 UT = Tue Aug 14 
17:59:59 1945 CWT isdst=1 gmtoff=-18000
America/Kentucky/Louisville  Tue Aug 14 23:00:00 1945 UT = Tue Aug 14 
18:00:00 1945 CPT isdst=1 gmtoff=-18000
America/Kentucky/Louisville  Sun Sep 30 06:59:59 1945 UT = Sun Sep 30 
01:59:59 1945 CPT isdst=1 gmtoff=-18000
America/Kentucky/Louisville  Sun Sep 30 07:00:00 1945 UT = Sun Sep 30 
01:00:00 1945 CST isdst=0 gmtoff=-21600
America/Kentucky/Louisville  Tue Jan  1 05:59:59 1946 UT = Mon Dec 31 
23:59:59 1945 CST isdst=0 gmtoff=-21600
America/Kentucky/Louisville  Tue Jan  1 06:00:00 1946 UT = Tue Jan  1 
01:00:00 1946 CDT isdst=1 gmtoff=-18000
America/Kentucky/Louisville  Sun Jun  2 06:59:59 1946 UT = Sun Jun  2 
01:59:59 1946 CDT isdst=1 gmtoff=-18000
America/Kentucky/Louisville  Sun Jun  2 07:00:00 1946 UT = Sun Jun  2 
01:00:00 1946 CST isdst=0 gmtoff=-21600
America/Kentucky/Louisville  Sun Apr 27 07:59:59 1947 UT = Sun Apr 27 
01:59:59 1947 CST isdst=0 gmtoff=-21600
America/Kentucky/Louisville  Sun Apr 27 08:00:00 1947 UT = Sun Apr 27 
03:00:00 1947 CDT isdst=1 gmtoff=-18000

with a strange transition CST to CDT on 1 January 1946.
I have searched Louisville newspaper archives and find no report of such 
a clock change around New Year 1946.

I find however the begin of CDT for 28 April 1946, and the switch back 
to CST on 2 June 1946.

Shanks also has the transition on 28 April 1946.

The cause I thnk is the strange formulation of Louisville rules

# This also includes Clark, Floyd, and Harrison counties in Indiana.
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT SAVE    LETTER
Rule Louisville 1921    only    -       May     1       2:00 1:00    D
Rule Louisville 1921    only    -       Sep     1       2:00 0       S
Rule Louisville 1941    1961    -       Apr     lastSun 2:00 1:00    D
Rule Louisville 1941    only    -       Sep     lastSun 2:00 0       S
Rule Louisville 1946    only    -       Jun     2       2:00 0       S
Rule Louisville 1950    1955    -       Sep     lastSun 2:00 0       S
Rule Louisville 1956    1960    -       Oct     lastSun 2:00 0       S
# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
Zone America/Kentucky/Louisville -5:43:02 -     LMT     1883 Nov 18 12:16:58
                         -6:00   US      C%sT    1921
                         -6:00 Louisville C%sT   1942
                         -6:00   US      C%sT    1946
                         -6:00 Louisville C%sT   1961 Jul 23 2:00
                         -5:00   -       EST     1968
                         -5:00   US      E%sT    1974 Jan  6 2:00
                         -6:00   1:00    CDT     1974 Oct 27 2:00
                         -5:00   US      E%sT

I attach a newspaper article describing the swith on 28 April.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mm.icann.org/pipermail/tz/attachments/20190806/3c32cb5b/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Bildschirmfoto 2019-08-06 um 17.58.39.png
Type: image/png
Size: 994868 bytes
Desc: not available
URL: <http://mm.icann.org/pipermail/tz/attachments/20190806/3c32cb5b/Bildschirmfoto2019-08-06um17.58.39-0001.png>