Boost Users :
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
> 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
(might take a little while to catch up).
Thx for the report.
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