From f147e9b7a4a0c8ed8be226cceb3b607bd3e65d1b Mon Sep 17 00:00:00 2001
From: Randy Morgan <digital.ipseity@gmail.com>
Date: Sun, 21 Oct 2012 16:56:42 +0900
Subject: [PATCH 1/3] Implemented first stage of gregorian to imperial date
 conversion

---
 nao-randym/date_converter.rb | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 nao-randym/date_converter.rb

diff --git a/nao-randym/date_converter.rb b/nao-randym/date_converter.rb
new file mode 100644
index 0000000..4215604
--- /dev/null
+++ b/nao-randym/date_converter.rb
@@ -0,0 +1,33 @@
+# encoding: UTF-8
+require 'date'
+a = %w[18680908 19120730 19261225 19890108 20300101]
+$eras = %w[明治 大正 昭和 平成]
+$date_ranges= {}
+(a.size-1).times do |i|
+  $date_ranges[(Date.parse(a[i])...Date.parse(a[i+1]))] = $eras[i]
+end
+
+def convert(input_date)
+  output = 'WTF'
+  date = Date.parse(input_date.gsub!('-', ''))
+  $date_ranges.each do |range, era|
+    if range.include? date
+      nengo = era
+      nengo_year = date.year - range.first.year + 1
+      output = date.strftime("#{nengo}#{nengo_year}年%m月%d日")
+    end
+  end
+  output
+end
+
+require 'test/unit'
+
+class TestFoo < Test::Unit::TestCase
+
+  def test_simple_one
+    ret = convert('2012-10-20')
+    assert_equal('平成24年10月20日', ret)
+  end
+
+
+end

From 1dcfd9ffe4c0469f13f9ab5cd9b9176b14fe507d Mon Sep 17 00:00:00 2001
From: Naoyoshi Aikawa <n.aikawa91@gmail.com>
Date: Sun, 21 Oct 2012 17:08:53 +0900
Subject: [PATCH 2/3] Add test for Showa/Heisei boundary

---
 nao-randym/date_converter.rb | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/nao-randym/date_converter.rb b/nao-randym/date_converter.rb
index 4215604..656faef 100644
--- a/nao-randym/date_converter.rb
+++ b/nao-randym/date_converter.rb
@@ -14,7 +14,7 @@ def convert(input_date)
     if range.include? date
       nengo = era
       nengo_year = date.year - range.first.year + 1
-      output = date.strftime("#{nengo}#{nengo_year}年%m月%d日")
+      output = date.strftime("#{nengo}#{nengo_year}年%-m月%-d日")
     end
   end
   output
@@ -29,5 +29,13 @@ def test_simple_one
     assert_equal('平成24年10月20日', ret)
   end
 
+  def test_showa_end
+    ret = convert('1989-01-07')
+    assert_equal('昭和64年1月7日', ret)
+  end
 
+  def test_heisei_start
+    ret = convert('1989-01-08')
+    assert_equal('平成1年1月8日', ret)
+  end
 end

From a2d7e58665c0e8a4c89bd0311301e25fb3f19061 Mon Sep 17 00:00:00 2001
From: Randy Morgan <digital.ipseity@gmail.com>
Date: Sun, 21 Oct 2012 17:27:57 +0900
Subject: [PATCH 3/3] added more tests and excluded invalid (or uncalculable)
 dates in the old, pre meiji 6 calendar.

---
 nao-randym/date_converter.rb | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/nao-randym/date_converter.rb b/nao-randym/date_converter.rb
index 656faef..d594946 100644
--- a/nao-randym/date_converter.rb
+++ b/nao-randym/date_converter.rb
@@ -1,19 +1,22 @@
 # encoding: UTF-8
 require 'date'
-a = %w[18680908 19120730 19261225 19890108 20300101]
-$eras = %w[明治 大正 昭和 平成]
+a = %w[18730101 19120730 19261225 19890108]
+a << (Time.now+(60*60*24)).strftime('%Y%m%d')
+eras = %w[明治 大正 昭和 平成]
 $date_ranges= {}
 (a.size-1).times do |i|
-  $date_ranges[(Date.parse(a[i])...Date.parse(a[i+1]))] = $eras[i]
+  $date_ranges[(Date.parse(a[i])...Date.parse(a[i+1]))] = eras[i]
 end
 
 def convert(input_date)
-  output = 'WTF'
+
+  output = 'Your date sucks.'
   date = Date.parse(input_date.gsub!('-', ''))
   $date_ranges.each do |range, era|
     if range.include? date
       nengo = era
       nengo_year = date.year - range.first.year + 1
+      nengo_year += 5 if era == '明治'
       output = date.strftime("#{nengo}#{nengo_year}年%-m月%-d日")
     end
   end
@@ -38,4 +41,29 @@ def test_heisei_start
     ret = convert('1989-01-08')
     assert_equal('平成1年1月8日', ret)
   end
+
+  def test_out_of_bounds_max
+    ret = convert((Time.now+(60*60*24)).strftime('%Y-%m-%d'))
+    assert_equal('Your date sucks.', ret)
+  end
+
+  def test_just_in_bounds_max
+    ret = convert(Time.now.strftime('%Y-%m-%d'))
+    assert_not_equal('Your date sucks.', ret)
+  end
+
+  def test_out_of_bounds_min
+    ret = convert('1872-12-31')
+    assert_equal('Your date sucks.', ret)
+  end
+
+  def test_just_in_bounds_min
+    ret = convert('1873-01-01')
+    assert_equal('明治6年1月1日', ret)
+  end
+
+  def test_out_of_bounds_max
+    ret = convert('2030-01-01')
+    assert_equal('Your date sucks.', ret)
+  end
 end