{"provider_name":"Hatena Blog","provider_url":"https://hatena.blog","categories":["Haskell"],"height":"190","title":"Haskell\u306b\u3088\u308b\u897f\u66a6(Day)\u548c\u66a6\u5909\u63db\u3001\u548c\u66a6\u306e\u6bd4\u8f03","blog_title":"sirocco \u306e\u66f8\u3044\u3066\u3082\u3059\u3050\u306b\u5fd8\u308c\u308b\u30e1\u30e2","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fsirocco.hatenadiary.org%2Fentry%2F20120402%2F1333318574\" title=\"Haskell\u306b\u3088\u308b\u897f\u66a6(Day)\u548c\u66a6\u5909\u63db\u3001\u548c\u66a6\u306e\u6bd4\u8f03 - sirocco \u306e\u66f8\u3044\u3066\u3082\u3059\u3050\u306b\u5fd8\u308c\u308b\u30e1\u30e2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2012-04-02 07:16:14","blog_url":"https://sirocco.hatenadiary.org/","version":"1.0","author_name":"sirocco","url":"https://sirocco.hatenadiary.org/entry/20120402/1333318574","type":"rich","width":"100%","image_url":null,"author_url":"https://blog.hatena.ne.jp/sirocco/","description":"Data.Time.Calendar \u306e Day\u578b\u3068\u8fd4\u9084\u53ef\u80fd\u306a\u548c\u66a6\u306e\u578b\u3001Wareki\u3092\u5b9a\u7fa9\u3057\u307e\u3057\u305f\u3002 Wareki \u306f Ord \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u305d\u306e\u307e\u307e\u6bd4\u8f03\u3001\u30bd\u30fc\u30c8\u3067\u304d\u307e\u3059\u3002 import Data.Time.Calendar (Day(..), fromGregorian, toGregorian, fromGregorianValid) import Data.List (find) import Control.Applicative ((<$>),(<*>)) import Test.HUnit data GName = Meiji | Taisho | Showa\u2026"}