{"id":4781,"date":"2022-03-07T23:45:34","date_gmt":"2022-03-07T14:45:34","guid":{"rendered":"https:\/\/obenkyolab.com\/?p=4781"},"modified":"2022-03-07T23:45:44","modified_gmt":"2022-03-07T14:45:44","slug":"%e3%80%90python%e3%80%91dateutil-relativedelta%e3%81%a7%e5%b9%b4%e6%9c%88%e3%81%ae%e7%9b%b8%e5%af%be%e5%a4%89%e5%8c%96%e5%80%a4%e3%82%92%e5%8f%96%e5%be%97%e3%81%99%e3%82%8b%e5%a0%b4%e5%90%88%e3%81%ae","status":"publish","type":"post","link":"https:\/\/obenkyolab.com\/?p=4781","title":{"rendered":"\u3010Python\u3011dateutil relativedelta\u3067\u5e74\u6708\u306e\u76f8\u5bfe\u5909\u5316\u5024\u3092\u53d6\u5f97\u3059\u308b\u5834\u5408\u306e\u6ce8\u610f\u70b9"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/obenkyolab.com\/?p=4781\/#%E6%A6%82%E8%A6%81\" >\u6982\u8981<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/obenkyolab.com\/?p=4781\/#%E6%A4%9C%E8%A8%BC%E7%92%B0%E5%A2%83\" >\u691c\u8a3c\u74b0\u5883<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/obenkyolab.com\/?p=4781\/#%E4%BD%BF%E7%94%A8%E3%81%99%E3%82%8B%E3%83%A9%E3%82%A4%E3%83%96%E3%83%A9%E3%83%AA\" >\u4f7f\u7528\u3059\u308b\u30e9\u30a4\u30d6\u30e9\u30ea<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/obenkyolab.com\/?p=4781\/#%E6%B3%A8%E6%84%8F%E7%82%B9%EF%BC%91%EF%BC%9Arelativedelta%E3%81%AE%E5%BC%95%E6%95%B0\" >\u6ce8\u610f\u70b9\uff11\uff1arelativedelta\u306e\u5f15\u6570<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/obenkyolab.com\/?p=4781\/#%E6%B3%A8%E6%84%8F%E7%82%B9%EF%BC%92%EF%BC%9A%E7%9B%B8%E5%AF%BE%E5%A4%89%E5%8C%96%E6%9C%88%E3%81%AB%E5%90%8C%E6%97%A5%E3%81%8C%E7%84%A1%E3%81%84%E5%A0%B4%E5%90%88%E3%81%AE%E6%8C%99%E5%8B%95\" >\u6ce8\u610f\u70b9\uff12\uff1a\u76f8\u5bfe\u5909\u5316\u6708\u306b\u540c\u65e5\u304c\u7121\u3044\u5834\u5408\u306e\u6319\u52d5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/obenkyolab.com\/?p=4781\/#%E3%81%BE%E3%81%A8%E3%82%81\" >\u307e\u3068\u3081<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%A6%82%E8%A6%81\"><\/span>\u6982\u8981<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Python\u3067\u904e\u53bb\u306e\u30c7\u30fc\u30bf\u306b\u5bfe\u3059\u308b\u96c6\u8a08\u306a\u3069\u3092\u884c\u3046\u969b\u306b\u6628\u5e74\u3001\u5148\u6708\u306a\u3069\u306e\u5358\u4f4d\u3067\u96c6\u8a08\u3057\u305f\u3044\u6642\u304c\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u6642\u306b\u306fdateutil\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3046\u3068\u697d\u306b\u5b9f\u73fe\u3067\u304d\u3066\u304a\u3059\u3059\u3081\u306a\u306e\u3067\u3059\u304c\u3001\u30b3\u30fc\u30c9\u3092\u9593\u9055\u3048\u308b\u3068\u601d\u308f\u306c\u7d50\u679c\u304c\u8fd4\u3063\u3066\u304f\u308b\u305f\u3081\u3001\u5b9f\u4f8b\u3092\u8e0f\u307e\u3048\u3066\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%A4%9C%E8%A8%BC%E7%92%B0%E5%A2%83\"><\/span>\u691c\u8a3c\u74b0\u5883<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>python 3.8.10<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BD%BF%E7%94%A8%E3%81%99%E3%82%8B%E3%83%A9%E3%82%A4%E3%83%96%E3%83%A9%E3%83%AA\"><\/span>\u4f7f\u7528\u3059\u308b\u30e9\u30a4\u30d6\u30e9\u30ea<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>datetime\u3068dateutil\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>import datetime\nfrom dateutil.relativedelta import relativedelta<\/code><\/pre><\/div>\n\n\n\n<p>dateutil\u306erelativedelta\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u6708\u3084\u5e74\u306e\u76f8\u5bfe\u5909\u5316\u5024\u3092\u3068\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u4e00\u5e74\u524d\u3084\u4e00\u304b\u6708\u5f8c\u306e\u65e5\u4ed8\u306a\u3069\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u3061\u3089\u306b\u8a73\u3057\u304f\u4f7f\u3044\u65b9\u304c\u8f09\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p><a href=\"https:\/\/dateutil.readthedocs.io\/en\/stable\/relativedelta.html\">relativedelta \u2014 dateutil 2.8.2 documentation<\/a><\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%B3%A8%E6%84%8F%E7%82%B9%EF%BC%91%EF%BC%9Arelativedelta%E3%81%AE%E5%BC%95%E6%95%B0\"><\/span>\u6ce8\u610f\u70b9\uff11\uff1arelativedelta\u306e\u5f15\u6570<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u4ee5\u4e0b\u306f\u4e00\u304b\u6708\u5f8c\u306e\u30b3\u30fc\u30c9\u3092\u53d6\u5f97\u3059\u308b\u5834\u5408\u306e\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>OK\u4f8b<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>from dateutil.relativedelta import relativedelta\nimport datetime\n\ntoday = datetime.date.today()\nlast_month_day = today - relativedelta(months=1)\nprint(&#39;today:&#39;,today)\nprint(&#39;last month on this day:&#39;,last_month_day)<\/code><\/pre><\/div>\n\n\n\n<pre id=\"block-5bd2ef85-be87-48a3-bf60-a7a0c37ded57\" class=\"wp-block-preformatted has-white-color has-black-background-color has-text-color has-background\">today: 2022-03-07\r\nlast month on this day: 2022-02-07<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>NG<\/strong>\u4f8b<\/p>\n\n\n\n<p>\u6b21\u306b\u4e00\u304b\u6708\u5f8c\u3092\u53d6\u5f97\u3059\u308b\u76ee\u7684\u3067\u306f\u9593\u9055\u3063\u3066\u3044\u308b\u30b3\u30fc\u30c9\u306e\u4f8b\u3067\u3059<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>today = datetime.date.today()\nlast_month_day = today - relativedelta(month=1)\nprint(&#39;today:&#39;,today)\nprint(&#39;last month on this day:&#39;,last_month_day)<\/code><\/pre><\/div>\n\n\n\n<pre class=\"wp-block-preformatted has-white-color has-black-background-color has-text-color has-background\">today: 2022-03-07\n<strong><em>last month on this day: 2022-01-07<\/em><\/strong><\/pre>\n\n\n\n<p>\u9593\u9055\u3044\u30dd\u30a4\u30f3\u30c8\u3068\u3057\u3066\u306f &#8221; relativedelta(month=1) &#8221; \u306e\u90e8\u5206\u3067\u3059\u3002\u5f15\u6570\u3067month=1\u306b\u3057\u3066\u3057\u307e\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u6b63\u3057\u304f\u306f&#8221;month<strong>s<\/strong>=1&#8243;\u3067\u3059\u3002s\u304c\u8981\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>month\u306b\u3057\u3066\u3057\u307e\u3063\u305f\u5834\u5408\u3001\u305d\u306e\u307e\u307e\u6708\u306e\u5024\u3068\u3057\u30661\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3057\u307e\u3044\u3001\u7d50\u679c\u304c1\u6708\u306b\u306a\u3063\u3066\u3057\u307e\u3063\u305f\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u306a\u305c\u3053\u308c\u304c\u6ce8\u610f\u70b9\u304b\u3068\u3044\u3046\u3068\u3001\u30a8\u30e9\u30fc\u3092\u5410\u304b\u305a\u306b\u305d\u306e\u307e\u307e\u901a\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306arelativedelta\u306e\u6027\u8cea\u3092\u982d\u306b\u5165\u308c\u3066\u304a\u304b\u306a\u3044\u3068\u6c17\u4ed8\u304b\u306a\u3044\u3046\u3061\u306b\u30d0\u30b0\u3092\u751f\u3093\u3067\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u6ce8\u610f\u70b9\u306b\u3064\u3044\u3066\u306fyear\u306b\u3064\u3044\u3066\u3082\u540c\u3058\u3067\u3059\u3002years\u3092year\u306b\u3057\u3066\u3057\u307e\u3046\u3068\u5e74\u306b&#8221;1&#8243;\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>NG\u4f8b<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>from dateutil.relativedelta import relativedelta\nimport datetime\n\ntoday = datetime.date.today()\nlast_year_day = today - relativedelta(year=1)\nprint(&#39;today:&#39;,today)\nprint(&#39;last year on this day:&#39;,last_year_day)<\/code><\/pre><\/div>\n\n\n\n<pre class=\"wp-block-preformatted has-white-color has-black-background-color has-text-color has-background\">today: 2022-03-07\n<em>last year on this day: 0001-03-07<\/em><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%B3%A8%E6%84%8F%E7%82%B9%EF%BC%92%EF%BC%9A%E7%9B%B8%E5%AF%BE%E5%A4%89%E5%8C%96%E6%9C%88%E3%81%AB%E5%90%8C%E6%97%A5%E3%81%8C%E7%84%A1%E3%81%84%E5%A0%B4%E5%90%88%E3%81%AE%E6%8C%99%E5%8B%95\"><\/span>\u6ce8\u610f\u70b9\uff12\uff1a\u76f8\u5bfe\u5909\u5316\u6708\u306b\u540c\u65e5\u304c\u7121\u3044\u5834\u5408\u306e\u6319\u52d5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u4f8b\u3048\u3070\u4eca\u6708\u306b31\u65e5\u307e\u3067\u3042\u308a\u3001\u5148\u6708\u306f28\u65e5\u307e\u3067\u3057\u304b\u306a\u3044\u3088\u3046\u306a\u5834\u5408\u306f\u4e38\u3081\u3089\u308c\u3066\u3059\u3079\u3066\u5148\u6708\u306e\u6700\u5f8c\u306e\u65e5\u4ed8\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>print(datetime.date(2022,3,31) - relativedelta(months=1))\nprint(datetime.date(2022,3,30) - relativedelta(months=1))\nprint(datetime.date(2022,3,29) - relativedelta(months=1))<\/code><\/pre><\/div>\n\n\n\n<pre class=\"wp-block-preformatted has-white-color has-black-background-color has-text-color has-background\">2022-02-28\n2022-02-28\n2022-02-28<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u3001<strong>\u4e00\u304b\u6708\u524d\u306b\u3057\u3066\u304b\u3089\u4e00\u304b\u6708\u5f8c\u306b\u623b\u3059\u64cd\u4f5c\u3092\u3059\u308b\u3068\u518d\u73fe\u6027\u304c\u7121\u3044\u5834\u5408\u304c\u3042\u308b<\/strong>\u305f\u3081\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5834\u5408\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>original_day = datetime.date(2022,3,31)\nlast_month_day = today - relativedelta(months=1)\nnot_original_day = last_month_day + relativedelta(months=1)\nprint(&#39;original day:&#39;,original_day)\nprint(&#39;last month on this day:&#39;,last_month_day)\nprint(&#39;not original day:&#39;,not_original_day)<\/code><\/pre><\/div>\n\n\n\n<pre class=\"wp-block-preformatted has-white-color has-black-background-color has-text-color has-background\">original day: 2022-03-31\nlast month on this day: 2022-02-28\n<strong><em>not original day: 2022-03-28<\/em><\/strong><\/pre>\n\n\n\n<p>3\u670831\u65e5\u304b\u30892\u670828\u65e5\u306b\u306a\u308a\u3001\u305d\u306e\u5f8c3\u670828\u65e5\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u6708\u306e\u76f8\u5bfe\u3060\u3051\u3067\u8003\u3048\u308b\u30683\u670831\u306b\u306a\u3063\u3066\u307b\u3057\u3044\u6c17\u3082\u3057\u307e\u3059\u304c\u306a\u308a\u307e\u305b\u3093\u3002\u305d\u3053\u306f\u53b3\u5bc6\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%81%BE%E3%81%A8%E3%82%81\"><\/span>\u307e\u3068\u3081<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>dateutil.relativedelta\u306f\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3059\u304c\u3001\u843d\u3068\u3057\u7a74\u7684\u306a\u3068\u3053\u308d\u304c\u3044\u304f\u3064\u304b\u3042\u308b\u305f\u3081\u6ce8\u610f\u70b9\u304c\u5fc5\u8981\u3002\u7279\u306b\u30a8\u30e9\u30fc\u3092\u5410\u304b\u306a\u3044\u305f\u3081\u3042\u3089\u304b\u3058\u3081\u3053\u306e\u3088\u3046\u306a\u7279\u6027\u306f\u982d\u306e\u7247\u9685\u306b\u5165\u308c\u3066\u304a\u304d\u305f\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8981 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