pod

Author: khwilliamson

locale.c

@@ -8268,7 +8268,9 @@ but sufficiently negative values (for earlier than 1900) may have different
 results on different systems and locales.  Some libc implementations may know
 when a given locale adopted the Greorian calendar, and adjust for that.
 Others will not.  (And some countries didn't adopt the Gregorian calendar
-until after 1900.)
+until after 1900.)  Probably all implementations assume modern time zones go
+back forever, before they were actually invented, starting in the last half of
+the 19th century.
 
 The treatment of the C<isdst> field has varied over previous Perl versions,
 and has been buggy (both by perl and by some libc implementations), but is now