[Python-Dev] Negative timedelta strings (original) (raw)
Xavier Morel python-dev at masklinn.net
Mon Mar 31 22:01:52 CEST 2014
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On 2014-03-28, at 17:19 , Skip Montanaro <skip at pobox.com> wrote:
(*) As an aside (that is, this belongs in a separate thread if you want to discuss it), in my opinion, attempting to support ISO 8601 formatting is pointless without the presence of an anchor datetime. Otherwise how would you know how far back "five months" or "seven years" was?
dateutil's relativedelta keeps the notion "abstract" until it's combined with an anchor datetime, at which point it's reified to a real duration[0].
If that's the case, then you might as well add the timedelta to your anchor datetime and just use datetime.strftime().
You can't even express "next month" with timedelta, since the duration of a month is not a fixed number of seconds.
[0] well not exactly, a relativedelta really defines a processing pipeline on its anchor date, which allows for fun stuff like "saturday the third week of next month".
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