Index: lang/perl/autobox-Numeric-Time/trunk/lib/autobox/Numeric/Time.pm
===================================================================
--- lang/perl/autobox-Numeric-Time/trunk/lib/autobox/Numeric/Time.pm (revision 13160)
+++ lang/perl/autobox-Numeric-Time/trunk/lib/autobox/Numeric/Time.pm (revision 13168)
@@ -51,4 +51,11 @@
 *month = \&months;
 
+# TANIGUCHI (aka nipotan) points out to use 365.2425 instead of 365.25.
+# According to wikipedia: http://en.wikipedia.org/wiki/Year ,
+# 365.25 is the average length of a year in the Julian calendar
+# and 365.2425 is the one in the Gregorian calendar.
+# so I think we should use 365.2425.
+# but I decided to use 365.25 because the number of ActiveSupport-2.0.2
+# (this module is inspired by ActiveSupport) is 365.25. thanks!
 sub years {
     return $_[0] * 3600 * 24 * 365.25;