[tz] Montreal timezone

Paul Eggert eggert at cs.ucla.edu
Mon Apr 18 15:37:13 UTC 2016

On 04/13/2016 07:47 PM, Vincent Tourneyrie wrote:
> The fact that PHP uses this list expose this timezone list to the public.

America/Montreal is still in tzdata and there are good 
backward-compatibility arguments for keeping it there. The symptoms you 
describe correspond to PHP bug 70816 
<https://bugs.php.net/bug.php?id=70816>. This bug affects not only 
America/Montreal, but many other tzdata identifiers, e.g., 
America/Buenos_Aires, Asia/Calcutta, Asia/Chongqing, and (my favorite!) 

I briefly looked at the PHP source code but could not determine how it 
decides which identifiers to publish. Apparently it's done by some 
procedure outside of the source code itself, a procedure that generates 
part of the source code.

I'll CC: this to Derick Rethans, who is expert on PHP time zones and may 
be able to explain what's going on and how to fix it. Derick, the thread 
starts here:


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