[Datetime-SIG] What's are the issues?

[Łukasz Rekucki]

On 29 July 2015 at 19:37, Alexander Belopolsky
<alexander.belopolsky at gmail.com> wrote:
> On Wed, Jul 29, 2015 at 1:21 PM, Chris Barker <chris.barker at noaa.gov> wrote:
>> But really does anyone really want to do the ugliness of trying to do time
>> calculation completely in a time-zone, discontinuous, ugly as hell
>> encoding????
>
> Yes, if both the input and the output of your program contain temporal
> data in the same timezone.
>
> For example, "Find a day with the largest trading volume on the New
> York Stock Exchange in 2014."
>
> The exchange publishes its data in New York local time and you know
> that trading hours are from 09:30 to 16:00 with a few exceptions that
> are again published in the local time.  The database is huge, so you
> select the data by day, split it into chunks by 5 minutes, add up the
> volumes for each day
> and find maximum.  Easy.  No need to know when the DST transitions
> were in New York in 2014.  Got the same database from Paris?  No need
> to change your code.  Now try to do the same in UTC.  I think my
> program will finish before you stop arguing what "a day" is.

That's because your program does not need to be time zone aware *at
all* (it works on Local Datetime). Everyone already agrees that this
work.

That doesn't mean that there are no other use cases.


-- 
Łukasz Rekucki