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

M.-A. Lemburg mal@lemburg.com
Wed, 06 Mar 2002 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 . 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.

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