[Python-Dev] Python-Dev Digest, Vol 69, Issue 143 (original) (raw)

Tennessee Leeuwenburg tleeuwenburg at gmail.com
Fri Apr 17 04:10:59 CEST 2009

Actually, that's a point.

If its' the 31st of Jan, then +1 monthdelta will be 28 Feb and another +1 will be 28 March whereas 31st Jan +2 monthdeltas will be 31 March.

That's the kind of thing which really needs to be documented, or I think people really will make mistakes.

For example, should a monthdelta include a goal-day so that the example above would go 31 Jan / 28 Feb / 31 March?

-T

On Fri, Apr 17, 2009 at 11:55 AM, Greg Ewing <greg.ewing at canterbury.ac.nz>wrote:

Jess Austin wrote:

This is a perceptive observation: in the absence of parentheses to dictate a different order of operations, the third quantity will differ from the second.

Another aspect of this is the use case mentioned right at the beginning of this discussion concerning a recurring event on a particular day of the month. If you do this the naive way by just repeatedly adding one of these monthdeltas to the previous date, and the date is near the end of the month, it will eventually end up drifting to the 28th of every month. -- Greg

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