Some little errors

Ciro Discepolo discepol at tin.it
Tue Dec 19 16:34:37 UTC 2000


 
Dear Sirs,

 

I'd like to give you my compliments for your enormous work in the time-zone file of the whole world. 

I am working on this file to obtain a second file for one of mine specific applications.

Unfortunately I have found some little errors or I think that these are some errors.

I'd like to explain these points.

 

First of all

>From a lot of specialist books  (for example Le Corre's book or Gabriel's book) I receive the information that in France, in the year 1943, and precisely from October 4, there was  a double daylight saving time. This fact is not present in your database as you can see lower:

 

# France

#

# Shanks seems to use `24:00' ambiguously; we resolve it with Whitman.

# Rule NAME            FROM            TO            TYPE            IN            ON            AT            SAVE            LETTER/S

Rule    France            1916            only            -            Jun            14            23:00s            1:00            S

Rule    France            1916            1919            -            Oct            Sun>=1            23:00s            0            -

Rule    France            1917            only            -            Mar            24            23:00s            1:00            S

Rule    France            1918            only            -            Mar     9          23:00s            1:00            S

Rule    France            1919            only            -            Mar     1          23:00s            1:00            S

Rule    France            1920            only            -            Feb            14            23:00s            1:00            S

Rule    France            1920            only            -            Oct            23            23:00s            0            -

Rule    France            1921            only            -            Mar            14            23:00s            1:00            S

Rule    France            1921            only            -            Oct            25            23:00s            0            -

Rule    France            1922            only            -            Mar            25            23:00s            1:00            S

# DSH writes that a law of 1923-05-24 specified 3rd Sat in Apr at 23:00 to 1st

# Sat in Oct at 24:00; and that in 1930, because of Easter, the transitions

# were Apr 12 and Oct 5.  Go with Shanks.

Rule    France            1922            1938            -            Oct            Sat>=1            23:00s            0            -

Rule    France            1923            only            -            May            26            23:00s            1:00            S

Rule    France            1924            only            -            Mar            29            23:00s            1:00            S

Rule    France            1925            only            -            Apr      4          23:00s            1:00            S

Rule    France            1926            only            -            Apr            17            23:00s            1:00            S

Rule    France            1927            only            -            Apr      9          23:00s            1:00            S

Rule    France            1928            only            -            Apr            14            23:00s            1:00            S

Rule    France            1929            only            -            Apr            20            23:00s            1:00            S

Rule    France            1930            only            -            Apr            12            23:00s            1:00            S

Rule    France            1931            only            -            Apr            18            23:00s            1:00            S

Rule    France            1932            only            -            Apr      2          23:00s            1:00            S

Rule    France            1933            only            -            Mar            25            23:00s            1:00            S

Rule    France            1934            only            -            Apr      7          23:00s            1:00            S

Rule    France            1935            only            -            Mar            30            23:00s            1:00            S

Rule    France            1936            only            -            Apr            18            23:00s            1:00            S

Rule    France            1937            only            -            Apr      3          23:00s            1:00            S

Rule    France            1938            only            -            Mar            26            23:00s            1:00            S

Rule    France            1939            only            -            Apr            15            23:00s            1:00            S

Rule    France            1939            only            -            Nov            18            23:00s            0            -

Rule    France            1940            only            -            Feb            25        2:00     1:00            S

# The French rules for 1941-1944 were not used in Paris,

# but were used in other places (e.g. Monaco).

Rule    France            1941            only            -            May     5          0:00            2:00            M # Midsummer

# Shanks says this transition occurred at Oct 6 1:00,

# but go with Denis.Excoffier at ens.fr (1997-12-12),

# who quotes the Ephemerides Astronomiques for 1998 from Bureau des Longitudes

# as saying 5/10/41 22hUT.

Rule    France            1941            only            -            Oct      6          0:00            1:00            S

Rule    France            1942            only            -            Mar     9          0:00            2:00            M

Rule    France            1942            only            -            Nov     2          3:00            1:00            S

Rule    France            1943            only            -            Mar            29        2:00     2:00            M

Rule    France            1943            only            -            Oct      4          3:00            1:00            S

Rule    France            1944            only            -            Apr      3          2:00            2:00            M

Rule    France            1944            only            -            Oct      8          1:00            1:00            S

Rule    France            1945            only            -            Apr      2          2:00            2:00            M

Rule    France            1945            only            -            Sep            16        3:00     0            -

# Shanks gives Mar 28 2:00 and Sep 26 3:00;

# go with Excoffier's 28/3/76 0hUT and 25/9/76 23hUT.

Rule    France            1976            only            -            Mar            28        1:00     1:00            S

Rule    France            1976            only            -            Sep            26        1:00     0            -

# Shanks gives 0:09 for Paris Mean Time, and Whitman gives 0:09:05,

# but Howse quotes the actual French legislation as saying 0:09:21.

# Go with Howse.  Howse writes that the time in France was officially based

# on PMT-0:09:21 until 1978-08-09, when the time base finally switched to UTC.

# Zone NAME             GMTOFF       RULES            FORMAT            [UNTIL]

Zone            Europe/Paris            0:09:21 -       LMT            1891 Mar 15  0:01

                                    0:09:21          -            PMT            1911 Mar 11    # Paris Mean Time

# Shanks gives 1940 Jun 14 0:00; go with Excoffier's 14/6/40 22hUT.

                                    0:00            France            WE%sT         1940 Jun 14 23:00

                                    1:00            C-Eur            CE%sT         1944 Aug 25

                                    0:00            France            WE%sT         1945 Sep 16  3:00

                                    1:00            France            CE%sT         1977

                                    1:00            EU            CE%sT

 

The second fact

 

In Italy, in 1944, there was a double situation: in the northern cities of the Gothic line (around Bologna) daylight saving time was excluded on October 2. Instead, in the southern cities of Gothic line, this daylight saving time, was excluded on September 17. This historic reference has been  proven by the Gazzetta Ufficiale (Official Government Journal). But this reference is not in your database.

 

 

The third fact

 

In Italy, after 1866, the whole nation was divided in three parts: the continental part, the Sicily part and the Sardinia part, with three different time zones. You can read about it in the Regio Decreto (king decree) number 3224 in the year 1866. But even this aspect is not present in your work.

 

 

Now I am asking myself: maybe I have not read well or these notices could have beeen left out by you?

 

But, if you have forgotten these items, it is even possible that there are many others items left out?

 

Please, I have another little query for you: do you know a software or a DLL (library) that includes all the correct world time-zones? Or, is there, on the web, a more recent release or your database with these corrections about the examples that I have made before?

 

Excuse me for disturbing you and I send you many regards and a Merry Christmas and a Happy New Year

 

 Ciro Discepolo

www.cirodiscepolo.it

discepol at tin.it



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