On Sat, Aug 22, 2020 at 10:29 AM Richard Damon <rich...@damon-family.org> wrote:
> On 8/22/20 1:07 PM, Stephen J. Turnbull wrote: > > If anything is to be added, I would prefer using ISO 8601 durations. > > > > https://en.wikipedia.org/wiki/ISO_8601#Durations > > > > The main differences are use of "P" and "T" to signal that it is a > > duration and allow both minutes and months to be identified by "M", > > and decimal fractions of the smallest unit present are permitted, and > > seconds is the smallest unit, so the above would be represented > > One issue with allowing Months here is then suddenly an interval becomes > dependent on when it is, so needs to be keep in a complex form, as a > month (and year) are variable length time units. > > Also, the math gets funny when you do things like this. Jan 31st + 1 > month is Feb 28th (or 29th) + 1 month is March 28th (or 29th), but Jan > 31st + 2 Months is March 31st, Similarly, adding a month and then > subtracting a month doesn't always get you back to your starting time. > > -- > Richard Damon > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/PAHZ6QSHPFZ5ZT57GMJDLTZLCAKQOVZ6/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Christopher Barker, PhD Python Language Consulting - Teaching - Scientific Software Development - Desktop GUI and Web Development - wxPython, numpy, scipy, Cython
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