[Datetime-SIG] Are there any "correct" implementations of tzinfo?

[Alexander Belopolsky]

On Sat, Sep 12, 2015 at 3:38 PM, Ethan Furman <ethan at stoneleaf.us> wrote:

> On 09/12/2015 12:16 PM, random832 at fastmail.com wrote:
>
> If there is a "fall back" transition tonight, then adding a day to a
>> time of 12 noon today could end up as:
>>
>> (1) 12 noon tomorrow, offset still DST.
>> (2) 12 noon tomorrow, offset in standard time, 25 hours from now in real
>> time.
>> (3) 11 AM tomorrow, offset in standard time, 24 hours from now in real
>> time
>>
>
> I believe option 2 is the intended semantics.


This is correct.   We call this behavior "classic arithmetic" on this list.
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