[Python-Dev] dateutil (original) (raw)

Christian Tanzer tanzer at swing.co.at
Mon Mar 15 10:38:15 EST 2004

> >> > d.forwardmonths(3).endofmonth() > >> > >> In dateutil, I think it's d + relativedelta(months=+1, day=1, days=-1). > >> Arguably, this is fairly trivial (highly non-obvious, but trivial...) > > > > Yes, it'd work, but "d + relativedelta(day=31)" would be enough. > > Hmm, I feel vaguely uncomfortable actually relying on the "round down out > of range values" behaviour. Presumably day=1000 would also work, and would > look even stranger to me :-)

This was a design decision, and I confess I'm pretty satisfied by the results of this decision. This simple decision created consistent and expectable results for operations which are not obvious.

Why don't you use "d + relativedelta(day=-1)" instead?

Just as easy to use, better error detection, and a big precedent.

-- Christian Tanzer http://www.c-tanzer.at/

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