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

From: Jeff Garland (jeff_at_[hidden])
Date: 2005-09-05 17:11:58

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.

This is fixed in CVS now.  You can fix your 1.33 distribution by downloading
wrapping_int.hpp version 1.7 from 

http://cvs.sourceforge.net/viewcvs.py/boost/boost/boost/date_time/wrapping_int.hpp?rev=1.6&view=log

(might take a little while to catch up).

Thx for the report.

Jeff