[Python-Dev] proposal: add basic time type to the standard library (original) (raw)

M.-A. Lemburg mal@lemburg.com
Fri, 08 Feb 2002 20:08:43 +0100

"M.-A. Lemburg" wrote:

In order to make mxDateTime subtypes of this new type we'd need to make sure that the datetime type uses a true struct subset of what I have in DateTime objects now: typedef struct { PyObjectHEAD /* Representation used to do calculations */ long absdate; /* number of days since 31.12. in the year 1 BC calculated in the Gregorian calendar. */ double abstime; /* seconds since 0:00:00.00 (midnight) on the day pointed to by absdate */ ...lots of broken down values needed to assure roundtrip safety... } Depending on the size of PyObjectHEAD, this should meet Jim Fultons requirements (the base type would of course not implement the "..." part :-).

I forgot to mention that there is another object type in mxDateTime too: DateTimeDelta. That's the type needed to represent the time difference between two DateTime instances, or what people usually call "time" :-)

It has the following type "signature":

typedef struct { PyObject_HEAD double seconds; /* number of delta seconds */

...some broken down values needed to assure roundtrip safety...

}

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