rename an argument of calc_wday.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64494 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
rename an argument of calc_wday.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64494 b2dd03c8-39d4-4d8f-98ff-823fe69b080e