compile errors on timezone database

[Ephraim Silverberg]

On Tue, 2 Dec 2003, Olson, Arthur David (NIH/NCI) wrote:

>> Rule    Mont    1927    1937    -       Apr     lastSat 24:00   1:00    D
>> Rule    Mont    1927    1937    -       Sep     lastSat 24:00   0       S
>>
>> Rule    Toronto 1930    1937    -       Apr     lastSat 24:00   1:00    D
>> Rule    Toronto 1930    1937    -       Sep     lastSat 24:00   0       S
>
> Mindful of folks with old compilers, it may be best to change the
> northamerica file to avoid use of 24:00, changing the
> "lastSat 24:00" references to "lastSun 0:00".

This would not be correct.

For example, in 1932, the last Saturday in April was April 30, 1932 so
the change to DST happened that night.  Changing the entry to "lastSun
0:00" would cause the change to DST in 1932 to take place on Sunday,
April 24, 1932 -- a week too early.

Ephraim
___________________________________________________________________________
Ephraim Silverberg, CSE System Group,        Phone number:    972-2-6585521
Hebrew University, Jerusalem, Israel.        Fax number:      972-2-6757244
WWW: http://www.cs.huji.ac.il/~ephraim       E-mail: ephraim at cse.huji.ac.il