[Python-Dev] datetime and timedelta enhancement (original) (raw)

M.-A. Lemburg mal at egenix.com
Mon Nov 17 12:37:51 CET 2008

On 2008-11-16 02:14, Nick Coghlan wrote:

M.-A. Lemburg wrote:

Guess I could add a .weeks attribute to mxDateTime, but no one ever asked for that so far. Given that there are at least 3 different ways to define the number of "weeks" between two dates, it may be something best left to applications to worry about.

I'd just use the term "weeks" as meaning 7 full days and then return a float value for fractions. That's the same convention used for .days. Anything more complicated would need to use DateTime values (see below).

OOo implements 2 of them [1] for its WEEKS() function, and there's then a fairly obvious 3rd variant based on a Sunday to Saturday week.

Cheers, Nick. [1] http://wiki.services.openoffice.org/wiki/Documentation/HowTos/Calc:WEEKSfunction

If you need ISO week counting or any other date based counting mechanism, you need to know the two DateTime values you're dealing with and possibly the calendar you're using.

mxDateTime has an .iso_week attribute to help with this, e.g.

Date(2008,11,17).isoweek (2008, 47, 1)

http://en.wikipedia.org/wiki/ISO_week

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