[tz] Undoing the effect of the new alike-since-1970 patch

[Paul Eggert]

On 9/14/21 11:41 AM, Almaz Mingaleev wrote:
> Platform-wise the main issue is that we can no longer use zone.tab
> to validate our region <-> time zone mapping.

Thanks for mentioning this. I was unaware that the compatibility concern 
focused on zone.tab.

Since zone.tab is present only for compatibility reasons, it makes sense 
to revert the changes to it. Proposed patch attached. I have not 
installed this patch into the development repository yet though, as it's 
a sensitive topic and I want people to have time for comments.

In the long run I suggest looking at zone1970.tab, as it has fewer 
entries and should be more convenient for users who simply want to set a 
time zone. It should even be possible to add a file 'zonenow.tab' that 
lists only zones that differ for current and future timestamps; that 
would be even smaller and so should be even simpler for users. None of 
this is urgent, though.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0001-Revert-May-patch-to-zone.tab.patch
Type: text/x-patch
Size: 15103 bytes
Desc: not available
URL: <http://mm.icann.org/pipermail/tz/attachments/20210914/06ef9590/attachment.bin>