explain tzset

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@155 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/bindings/perl-shared/RRDs.pm b/bindings/perl-shared/RRDs.pm
index 2cd3370..6146e43 100644 (file)
--- a/bindings/perl-shared/RRDs.pm
+++ b/bindings/perl-shared/RRDs.pm
@@ -111,6 +111,17 @@ integers, a pointer to an array and a pointer to a array of pointers.
 
 See the examples directory for more ways to use this extension.
 
+=head1 NOTE
+
+If you are manipulating the TZ variable you should also call the posixs
+function tzset to initialize all internal state of the library for properly
+operating in the timezone of your choice.
+
+ use POSIX qw(tzset);
+ $ENV{TZ} = 'CET';   
+ POSIX::tzset();     
+
+
 =head1 AUTHOR
 
 Tobias Oetiker E<lt>oetiker@ee.ethz.chE<gt>