esa にカレンダーの表をはりつける - Qiita

require 'active_support' require 'active_support/core_ext' today = Date.today print "日\t月\t火\t水\t木\t金\t土\n" today.beginning_of_month.wday.times{ print "\t" } (today.beginning_of_month..today.end_of_month).each do |day| print "#{day.day}" print "\t" unless day.saturday? print "\n" if day.saturday? end (5 - today.end_of_month.wday).times{ print "\t" }