[Datetime-SIG] Timeline arithmetic?

[Alexander Belopolsky]

On Fri, Sep 4, 2015 at 1:37 PM, Carl Meyer <carl at oddbird.net> wrote:

> Principle of least surprise for casual users. On this question, "you
> should use UTC for arithmetic" is equivalent to "you should use a period
> recurrence library for period arithmetic."
>

Keep in mind that the standard library should not only support "casual
users", but also those who will write a "period
recurrence library" for those "casual users."  This is where classic
arithmetic is indispensable.
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