[tz] Three more tweaks

[Howard Hinnant]

Hi,

I’ve surveyed the entire database for transitions 24h or less apart with one of them being a faux transition.  I found only 6.  You just eliminated the first.  Two more are in Europe/Istanbul and I see no way to eliminate the faux transition.  Here are the remaining 3 with explanations and fixes:

———————————

Europe/Simferopol 1996 Mar 31:

1996-03-30 20:59:59u = 1996-03-30 23:59:59 MSK  // 03:00:00   E-Eur  MSK/MSD
1996-03-30 21:00:00u = 1996-03-31 01:00:00 MSD  // 03:00:00   E-Eur  MSK/MSD

And then 3h later:

1996-03-30 23:59:59u = 1996-03-31 03:59:59 MSD  // 03:00:00   E-Eur  MSK/MSD
1996-03-31 00:00:00u = 1996-03-31 04:00:00 MSD  // 03:00:00   01:00  MSD

The second faux transition can be combined with the first actual transition with:

diff --git a/europe b/europe
index 630c234..1242927 100644
--- a/europe
+++ b/europe
@@ -2364,7 +2364,7 @@ Zone Europe/Simferopol     2:16:24 -      LMT     1880
 # changed in May.
                         2:00   E-Eur   EE%sT   1994 May
 # From IATA SSIM (1994/1997), which also says that Kerch is still like Kiev.
-                        3:00   E-Eur   MSK/MSD 1996 Mar 31  3:00s
+                        3:00   E-Eur   MSK/MSD 1996 Mar 31  0:00s
                         3:00   1:00    MSD     1996 Oct 27  3:00s
 # IATA SSIM (1997-09) says Crimea switched to EET/EEST.
 # Assume it happened in March by not changing the clocks.

———————————

Europe/Sofia 1982 Sep 26:

1982-09-25 22:59:59u = 1982-09-26 01:59:59 EEST  // 02:00:00   Bulg   EE%sT
1982-09-25 23:00:00u = 1982-09-26 02:00:00 EEST  // 02:00:00   C-Eur  EE%sT

And then 1h later:

1982-09-25 23:59:59u = 1982-09-26 02:59:59 EEST  // 02:00:00   C-Eur  EE%sT
1982-09-26 00:00:00u = 1982-09-26 02:00:00 EET   // 02:00:00   C-Eur  EE%sT

The first faux transition can be merged with the second actual transition with:

diff --git a/europe b/europe
index 630c234..f096de5 100644
--- a/europe
+++ b/europe
@@ -845,7 +845,7 @@ Zone        Europe/Sofia    1:33:16 -       LMT     1880
                        1:00    C-Eur   CE%sT   1945
                        1:00    -       CET     1945 Apr  2  3:00
                        2:00    -       EET     1979 Mar 31 23:00
-                       2:00    Bulg    EE%sT   1982 Sep 26  2:00
+                       2:00    Bulg    EE%sT   1982 Sep 26  3:00
                        2:00    C-Eur   EE%sT   1991
                        2:00    E-Eur   EE%sT   1997
                        2:00    EU      EE%sT

———————————

Europe/Tallinn 1999 Nov  1:

1999-10-31 00:59:59u = 1999-10-31 03:59:59 EEST  // 02:00:00   EU   EE%sT 
1999-10-31 01:00:00u = 1999-10-31 03:00:00 EET   // 02:00:00   EU   EE%sT 

And then 21h later:

1999-10-31 21:59:59u = 1999-10-31 23:59:59 EET  // 02:00:00   EU    EE%sT 
1999-10-31 22:00:00u = 1999-11-01 00:00:00 EET  // 02:00:00         EET

The second faux transition can be combined with the first actual transition with:

diff --git a/europe b/europe
index 630c234..c788416 100644
--- a/europe
+++ b/europe
@@ -1084,7 +1084,7 @@ Zone      Europe/Tallinn  1:39:00 -       LMT     1880
                        3:00    Russia  MSK/MSD 1989 Mar 26  2:00s
                        2:00    1:00    EEST    1989 Sep 24  2:00s
                        2:00    C-Eur   EE%sT   1998 Sep 22
-                       2:00    EU      EE%sT   1999 Nov  1
+                       2:00    EU      EE%sT   1999 Oct  31  4:00
                        2:00    -       EET     2002 Feb 21
                        2:00    EU      EE%sT

Thanks,
Howard