----- Mensaje original ----- De: Beman Dawes <bdawes@acm.org> Fecha: Domingo, Octubre 31, 2004 11:03 pm Asunto: Re: [boost] [filesystem] regressions for operations_test

At 03:56 PM 10/31/2004, JOAQUIN LOPEZ MU?Z wrote:

...

Hi,

msvc, msvc-stlport, iw-7_1-vc6 and iw-7_1-vc6-stlp-4_5_3 currently fail this test (see for instance http://tinyurl.com/4xo4a). I don't know for sure, but I've got the hunch this might be related with the fact that 2004 is a leap year and today we've had a 1-hour adjustment in some countries due to the daylight saving policy. These two facts combined might yield an offset outside the expected range. Just wanted to note this in case it might ring a bell for somebody.

Or it might just be because offsets cross the daylight savings time boundary.

Well, that's what I was saying. The leap year and the cross-daylight saving issues combined will yield a time difference of 366*24*3600+3600 seconds, off the expected value by 1 hour.

I'll wait until the tests have cycled again, and then take a look.

If my theory's correct, these tests will revert to normal by November 2. This phenomenon will happen again 2008, October 26 to 28, and 2012 October 28 to 30. In 2016, however, the cross-daylight offset plays on the subtracting raher than the adding side, so the tests won't fail :) Excuse my indulgence on this silly issue. Joaquín M Lópeez Muñoz Telefónica, Investigación y Desarrollo