diff --git a/kohei-francesco/japanese_calendar_spec.rb b/kohei-francesco/japanese_calendar_spec.rb
new file mode 100644
index 0000000..303ec64
--- /dev/null
+++ b/kohei-francesco/japanese_calendar_spec.rb
@@ -0,0 +1,66 @@
+# coding: utf-8
+
+require 'date'
+
+class Calendar
+  @@nengo = [
+    { simple: "meiji", name: "明治", start: Date.new(1868, 1, 1) },
+    { simple: "taisyo", name: "大正", start: Date.new(1912, 9, 8) },
+    { simple: "showa", name: "昭和", start: Date.new(1926, 12, 25) },
+    { simple: "heisei", name: "平成", start: Date.new(1989, 1, 8) }
+  ]
+
+  END_OF_THE_WORLD = Date.new(2200,1,1)
+
+  def self.calc_range(era, idx)
+    last = @@nengo[idx+1]
+    last = last.nil? ? END_OF_THE_WORLD : last[:start]
+    era[:start]...last
+  end
+
+  @@nengo.each_with_index do |era, idx|
+    era[:range] = Calendar.calc_range(era, idx)
+  end
+
+  NENGO = @@nengo
+
+  def initialize(greg_date)
+    @greg_date = Date.parse(greg_date)
+  end
+
+  def convert
+    nengo = get_nengo @greg_date
+    format @greg_date, nengo
+  end
+
+  def get_nengo(date)
+    nengo = @@nengo.find{ |era| era[:range].include? date }
+    year = date.year - nengo[:start].year + 1
+    "#{nengo[:name]}#{year}"
+  end
+
+  def format(date, nengo)
+    "#{nengo}年#{date.month}月#{date.day}日"
+  end
+end
+
+describe "english to japanese calendar" do
+  it "calculates date ranges" do
+    Calendar::NENGO.last[:range].should == (Date.new(1989, 1, 8)...Calendar::END_OF_THE_WORLD)
+  end
+
+  it "converts date to japanese" do
+    date = Calendar.new("2012-10-20").convert
+    date.should == "平成24年10月20日"
+  end
+
+  it "converts date to japanese" do
+    date = Calendar.new("1988-01-01").convert
+    date.should == "昭和63年1月1日"
+  end
+
+  it "converts date to japanese" do
+    date = Calendar.new("1868-12-01").convert
+    date.should == "明治1年12月1日"
+  end
+end