perldelta for GH Perl#23878

Author: khwilliamson

pod/perldelta.pod

@@ -396,6 +396,16 @@ the first branch would correctly autovivify C<$h{foo}> to an array ref,
 but the second branch might incorrectly autovivify C<$h{bar}> to a hash
 ref. [GH #18669].
 
+=item *
+
+Perl 5.42.0 does not handle the transition to/from daylight savings time
+properly.  The time and/or timezone can be off by an hour in the
+intervals surrounding such transitions.  This is a regression from
+earlier releases, and is now fixed.  This bug was evident from perl
+space in the L<POSIX/strftime> function, and in XS code with any of
+L<perlapi/my_strftime>, L<perlapi/sv_strftime_ints>, or
+L<perlapi/sv_strftime_tm>.
+
 =back
 
 =head1 Known Problems