Datetime utility functions

Invalid User user at invalid.domain
Wed Sep 17 10:05:35 CEST 2003


Try 'mxDateTime' available at
 
http://www.egenix.com/files/python/eGenix-mx-Extensions.html#Download-mxBASE

It most likely has what you are looking for.

Paul Moore wrote:
> I was just writing some code which did date/time manipulations, and I
> found that the Python 2.3 datetime module does not supply a number of
> fairly basic functions. I understand the reasoning (the datetime
> module provides a set of datatypes, and doesn't attempt to get into
> the murky waters of date algorithms) but as these things can be quite
> tricky to get right, I was wondering if anyone has already implemented
> any date algorithms, or alternatively if I'd missed some easy way of
> doing what I'm after.
> 
> My specific requirements were:
> 
> 1. Get the last day of the month contatining a given date(time). I
> really was surprised to find this one missing, as it seems to me that
> the datetime module must know what the last day for each month is, so
> exposing it wouldn't have been hard.
> 
> 2. Add a number of months to a date. This is messy, as there are
> options (what is one month after 31st Jan). The trouble is that the
> calculation, while simple, is tricky to get right (month is 1-based,
> so off-by-1 errors are easy to make, and divmod isn't as useful as
> you'd first think).
> 
> Other "nice to have" functions which I didn't need for this program,
> but which I have found useful in the past, are
> 
> - Round a date(time) to a {year,month,day,quarter,week,...} Or
> truncate. Or (occasionally) chop to the next higher boundary
> (ceiling).
> - Calculate the number of {years,months,days,...} between two dates.
> (Which is more or less the equivalent of rounding a timedelta).
> 
> These latter two aren't very well defined right now, because I have no
> immediate use case.
> 
> In the absence of anything else, I'll probably write a "date
> utilities" module for myself at some point. But I'd hate to be
> reinventing the wheel.
> 
> Paul.





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