[tz] Timezone change detection

[Tom Lane]

Paul Eggert via tz <tz at iana.org> writes:
> On 9/3/21 9:53 AM, Edward Tomasz Napierała via tz wrote:
>> The use case is to make the applications handle
>> moving between timezones, or changing the default system timezone.

> Won't the change break applications like 'zdump' that call 'localtime' 
> several times and assume that all the 'localtime' calls return 
> consistent values for a single timezone?

I think the odds of this breaking stuff are significantly larger
than the odds of it doing useful stuff.  I find it particularly
frightening that the patch doesn't appear to allow the calling
application to have any say in the matter.

			regards, tom lane