On Sat, Aug 22, 2020 at 7:29 PM 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. > Indeed, datetime.timedelta accepts seconds, minutes, hours, days, and weeks, but not months or years.
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