[tz] Preparing to fork tzdb

[Paul Eggert]

On 9/20/21 6:52 AM, Derick Rethans via tz wrote:
> So will the PHP project.

With the patches I emailed in 
<https://mm.icann.org/pipermail/tz/2021-September/030456.html>, the PHP 
project should be able to avoid the effects of the alike-since-1970 
patches without our having to fork tzdb, by using something like the 
attached (untested) patch to PHP's timelib.

However before taking such an approach, please read the comments of the 
bias2021a.bp file, which suggest that you'll need to adjust that file. 
For more, please see my other recent email 
<https://mm.icann.org/pipermail/tz/2021-September/030458.html>.
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