You'll be stuck with the time zone rules as of the period when the DateTime::TimeZone modules were generated, based on the Olson database that was used.
It means that if you try to check the time for somewhere but the rules now in effect are different from the ones in effect back then, you will get different results for what the time zone offset is, or when the transitions between winter and summer (standard and daylight saving) times occur. In extreme cases, this could be a whole day off; one country relatively recently switched from one side to the other side of the international date line. Note that the rules change multiple times a year (somewhere in the world, some country changes the rules, often at close to the last minute). There were at least 9 releases of the Olson database in 2013 and 2012; 14 in 2011 and 2010; 19 in 2009 (and at least 5 so far in 2014). On Thu, Jul 17, 2014 at 7:43 AM, Juan Jimenez <jjime...@electric-cloud.com> wrote: > Folks, > > I know this is going to seem like a dumb question, but please bear with > me. > > What consequences will PERL programmers face with DateTime, particularly > with time zone handling and calculations, if they are still using v5.08 of > PERL and the DateTime version that came with that (which I believe dates to > v5.06 of PERL). > > Regards, > Juan > -- Jonathan Leffler <jonathan.leff...@gmail.com> #include <disclaimer.h> Guardian of DBD::Informix - v2013.0521 - http://dbi.perl.org "Blessed are we who can laugh at ourselves, for we shall never cease to be amused."
