[Python-Dev] datetime +/- scalars (int, long, float)?

2002年3月06日 22:14:08 +0100

Tim Peters wrote:
>> [Guido, on "naive time"]
> > ...
> > Naive time calculations are easier than local time calculations,
> > because they don't have to worry about DST. You only have to be
> > careful when converting between naive time and UTC (or anything else
> > that has a concept of timezone).
>> [MAL]
> > Just to let you know: you are slowly narrowing in on mxDateTime ;-)
> > (the naive type is pretty much what I have implemented as
> > DateTime object).
>> It's not *that* slowly -- this started less than a week ago <wink>. But,
> yes, Guido's basic class is heading more in the direction of what mxDateTime
> started as. By the time you had need of documenting things like
>> Adding/Subtracting DateTime instances causes the result to
> inherit the calendar of the left operand.
>> I think "naive time" got lost in the options. Guido has in mind a pure
> "proleptic Gregorian" gimmick. We'll see how long that lasts ...

mxDateTime was purely Gregorian until I realized that all historic
dates are in fact referenced using the Julian calendar.
Note that mxDateTime doesn't try to be clever about the switch 
from one to the other: it simply provides both versions via 
methods or constructors.
-- 
Marc-Andre Lemburg
CEO eGenix.com Software GmbH
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