Re: [Boost-users] [date_time] problem adding negative number of months

From: Bart (bartmann.nsd_at_[hidden])
Date: 2005-08-23 11:39:04

On Mon, 22 Aug 2005 11:26:12 +0200, Guido Spahn wrote:

> Hello,
> 
> when adding a negative number of months to a date(y, m, d), an exception 
> "Month number is out of range 1..12" is raised if the resulting month m2 
> belongs to a year y2 < y and m2 > m. For example
> 
>   date(2005, Jan, 1) + months(-1) fails
>   date(2005, Feb, 1) + months(-1) doesn't fail
>   date(2005, Feb, 1) + months(-2) fails
>   date(2005, Feb, 1) + months(-12) doesn't fail
>   date(2005, Feb, 1) + months(-13) doesn't fail
>   date(2005, Feb, 1) + months(-14) fails
> 
> I checked it only with release 1.33 using the appended code. There is no 
> problem adding or substracting any positive number of months.
> 
> Hopefully I didn't miss this topic in the mailing list archive. Thanks in 
> advance,
> 
> Guido
> 

This certainly isn't the correct behavior. 
Thank you for bringing it to our attention.

Bart