{"id":1233,"date":"2021-03-31T09:25:18","date_gmt":"2021-03-31T00:25:18","guid":{"rendered":"https:\/\/www.opentone.co.jp\/ot-lab\/?p=1233"},"modified":"2025-05-12T10:06:14","modified_gmt":"2025-05-12T01:06:14","slug":"past-date","status":"publish","type":"post","link":"https:\/\/www.opentone.co.jp\/ot-lab\/all\/web-system\/past-date","title":{"rendered":"\u904e\u53bb\u306e\u540c\u3058\u66dc\u65e5\u306e\u65e5\u4ed8\u3092\u53d6\u5f97\u3057\u305f\u3044"},"content":{"rendered":"\n<p>\u3053\u3093\u306b\u3061\u306f\u3002kk\u3067\u3059\u3002<\/p>\n\n\n\n<p>\uff5e\u4f8b\u3048\u3070\u3053\u3093\u306a\u30b7\u30c1\u30e5\u30a8\u30fc\u30b7\u30e7\u30f3\uff5e<\/p>\n\n\n\n<p>\u4eca\u5e74\u306e\u6765\u5834\u8005\u6570\u306e\u63a8\u79fb\u3092\u5206\u6790\u3057\u3066\u3044\u307e\u3059\u3002<br>\u3084\u306f\u308a\u4f11\u65e5\u3001\u7279\u306b\u795d\u65e5\u542b\u3081\u305f\u9023\u4f11\u306f\u6765\u5834\u8005\u6570\u304c\u591a\u3044\u3067\u3059\u3002<br>\u3055\u3066\u3001\u3058\u3083\u3042\u53bb\u5e74\u306e\u540c\u3058\u6642\u671f\u306e\u4f11\u65e5\u3068\u6bd4\u3079\u3066\u3069\u3046\u3060\u308d\u3046\u304b\uff1f<\/p>\n\n\n\n<p>\uff5e\uff5e\uff5e\uff5e\uff5e\uff5e\uff5e\uff5e\uff5e\uff5e\uff5e\uff5e\uff5e\uff5e\uff5e\uff5e<\/p>\n\n\n\n<p>\u3053\u3053\u3067\u5fc5\u8981\u306b\u306a\u308b\u306e\u306f\u3001\u300c\u53bb\u5e74\u306e\u540c\u3058\u6642\u671f\u306e\u4f11\u65e5\u300d\u306e\u65e5\u4ed8\u3067\u3059\u3002<br>\u4eba\u9593\u3067\u3042\u308c\u3070\u3001\u30ab\u30ec\u30f3\u30c0\u30fc\u3092\u3081\u304f\u308a\u306a\u304c\u3089\u3001\u3042\u3041\u3053\u306e\u65e5\u3060\u306d\u30fc\u3068\u76ee\u3067\u898b\u3066\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u304c\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3060\u3068\u305d\u3046\u306f\u3044\u304d\u307e\u305b\u3093\u3002<br>\u30ed\u30b8\u30c3\u30af\u3067\u7b97\u51fa\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br>\u3053\u306e\u3088\u3046\u306a\u30ed\u30b8\u30c3\u30af\u3092\u8003\u3048\u308b\u6a5f\u4f1a\u304c\u3061\u3087\u3063\u3068\u3042\u3063\u305f\u306e\u3067\u3001\u4eca\u56de\u306f\u305d\u306e\u7d39\u4ecb\u3092\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<br>\u203bJavascript \u3067\u4f5c\u6210\u3057\u307e\u3059<\/p>\n\n\n\n<p>\u52d5\u4f5c\u8981\u4ef6\u3092\u307e\u3068\u3081\u308b\u3068\u3053\u3093\u306a\u611f\u3058\u3067\u3059<br>\u30fb\u3042\u308b\u7279\u5b9a\u306e\u65e5\u4ed8\u3092\u6307\u5b9a\u3059\u308b\uff08\u4f8b\uff1a2015\u5e7411\u670821\u65e5(\u571f)\uff09<br>\u30fb\u305d\u306e\u65e5\u4ed8\u306b\u5bfe\u3057\u3001\u904e\u53bb\u306e\u540c\u3058\u6642\u671f\u3001\u540c\u3058\u66dc\u65e5\u306e\u65e5\u4ed8\u3092\u53d6\u5f97\u3059\u308b<br>(\u4f8b\uff1a2015\u5e7411\u670821\u65e5(\u571f)\u306b\u5bfe\u3057\u30012014\u5e7411\u670822\u65e5(\u571f)\u3092\u53d6\u5f97)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1\uff0e\u53bb\u5e74\u306e\u540c\u3058\u66dc\u65e5\u306e\u65e5\u4ed8\u3092\u53d6\u3063\u3066\u307f\u308b<\/h3>\n\n\n\n<p>\u540c\u3058\u65e5\u4ed8\u3067\u3042\u308c\u3070\u3001\u5358\u306b\u5e74\u3092\u5f15\u3051\u3070\u826f\u3044\u3060\u3051\u3067\u3059\u304c\u3001\u300c\u540c\u3058\u66dc\u65e5\u300d\u3068\u306a\u308b\u3068\u305d\u3046\u306f\u3044\u304d\u307e\u305b\u3093\u3002<br>1\u5e74\u306f365\u65e5\u3067\u30011\u9031\u9593\u306f7\u65e5\u3067\u3059\u3002<br>\u306a\u306e\u3067\u30011\u5e74\u304c\u4f55\u9031\u9593\u304b\uff1f\u3068\u3044\u3046\u306e\u306f\u3001<br>365 \u00f7 7 \uff1d 52\u9031 \u4f59\u308a 1\u65e5\uff08\u3046\u308b\u3046\u5e74\u306e\u5834\u5408\u306f\u3001366\u65e5\u3068\u306a\u308b\u306e\u3067\u4f59\u308a2\u65e5\uff09<br>\u3068\u306a\u308a\u307e\u3059\u3002<br>\u3064\u307e\u308a\u3001\u4eca\u65e5(\u5bfe\u8c61)\u306e\u65e5\u4ed8\u304b\u308952\u5468\u9593\u5206(364\u65e5)\u3092\u5f15\u304f\u3068\u3001\u53bb\u5e74\u306e\u540c\u3058\u66dc\u65e5\u306e\u65e5\u4ed8\u306b\u306a\u308a\u307e\u3059\u3002<br>\u30b3\u30fc\u30c9\u3067\u66f8\u304f\u3068\u3053\u3093\u306a\u611f\u3058\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u53bb\u5e74\u306e\u540c\u3058\u66dc\u65e5\u306e\u65e5\u3092\u8a08\u7b97\u3059\u308b\u95a2\u6570<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">[javascript]\n    \/\/ \u6e1b\u7b97\u3059\u308b\u65e5\u6570\n    var SUBTRACT_DAYS_WEEK = 7;\n    var SUBTRACT_DAYS_YEAR = SUBTRACT_DAYS_WEEK * 52;\n    \n    function getDateOfSameDayOfWeek(inputDate) {\n        \n        \/\/ \u57fa\u6e96\u65e5 \u65e5\u4ed8\u53d6\u5f97\n        var date = new Date(inputDate);\n\n        \/\/ \u73fe\u5728\u306e\u65e5\u304b\u3089\u300152\u9031\u9593\u5206\u5f15\u304f(364\u65e5\u3001\u524d\u5e74\u306e\u540c\u3058\u66dc\u65e5\u3068\u306a\u308b)\n        var dayOfMonth = date.getDate();\n        date.setDate(dayOfMonth - SUBTRACT_DAYS_YEAR);\n        \n        return date;\n    }\n[\/javascript]\n\n\u52d5\u4f5c\u78ba\u8a8d\u7528\u306eHTML\u306f\u3053\u3061\u3089\n\u2192<a href=\"http:\/\/labs.opentone.co.jp\/wp-content\/uploads\/2015\/11\/getDateOfSameDayOfWeek.html\" target=\"_blank\" rel=\"noreferrer noopener\">getDateOfSameDayOfWeek<\/a><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2\uff0e\uff4e\u5e74\u524d\u306e\u540c\u3058\u66dc\u65e5\u306e\u65e5\u4ed8\u3092\u53d6\u308a\u305f\u3044<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">\u53bb\u5e74\u306e\u65e5\u4ed8\u306f\u4e0a\u8a18\u306e\u901a\u308a\u53d6\u308c\u307e\u3057\u305f\u304c\u3001\u6307\u5b9a\u3057\u305f\u5e74\u6570\u5206\u3055\u304b\u306e\u307c\u3063\u305f\u540c\u3058\u66dc\u65e5\u306e\u65e5\u4ed8\u306f\u3069\u3046\u3067\u3057\u3087\u3046\uff1f\n\u203b\u4f8b\u3048\u3070\u3001\u904e\u53bb5\u5e74\u5206\u3092\u307e\u3068\u3081\u3066\u8868\u793a\u3057\u3066\u6bd4\u8f03\u3057\u305f\u3044\n\u4e0a\u8a18\u95a2\u6570\u3092\u305f\u3060\u5358\u306b\u30eb\u30fc\u30d7\u3057\u3066\u8a08\u7b97\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u305d\u306e\u3046\u3061\u9031\u304c\u30ba\u30ec\u3066\u3057\u307e\u3044\u307e\u3059\u3002\n\u307e\u305f\u3001\u305f\u3068\u30481\u5e74\u524d\u3067\u3042\u3063\u305f\u3068\u3057\u3066\u3082\u3001\u6307\u5b9a\u3057\u305f\u65e5\u4ed8\u306b\u3088\u3063\u3066\u306f1\u65e5\uff5e2\u65e5\u305a\u308c\u308b\u3060\u3051\u3067\u9031\u304c\u305a\u308c\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002\n\uff08\u4f8b\uff092013\u5e741\u670814\u65e5\uff08\u7b2c2\u9031\u6708\u66dc\uff09\n\u3000\u3000\u3000\u2192\u4e0a\u8a18\u8a08\u7b97\u3092\u884c\u3046\u3068\u30012012\u5e741\u670816\u65e5\uff08\u7b2c3\u9031\u6708\u66dc\uff09\u306b\u306a\u308b\n\u3000\u3000\u3000\u2192\u4ed5\u69d8\u7684\u306b\u306f\u30012012\u5e741\u67089\u65e5\uff08\u7b2c2\u9031\u6708\u66dc\uff09\u3068\u306a\u3063\u3066\u6b32\u3057\u3044\n\n\u305d\u3053\u3067\u3001\u5bfe\u8c61\u65e5\u304c\u5e74\u521d\u304b\u3089\u6570\u3048\u3066\u7b2c\u4f55\u9031\u3067\u3042\u308b\u304b\u8a08\u7b97\u3057\u3066\u304a\u304d\u307e\u3059\u3002\n\u6628\u5e74\u306e\u540c\u3058\u66dc\u65e5\u306e\u65e5\u4ed8\u3092\u8a08\u7b97\u5f8c\u3001\u540c\u69d8\u306b\u305d\u306e\u5e74\u306e\u7b2c\u4f55\u9031\u3067\u3042\u308b\u304b\u8a08\u7b97\u3057\u3001\u305a\u308c\u3066\u3044\u308b\u5834\u5408\u306b1\u9031\u5206\u623b\u3057\u307e\u3059\u3002<\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>\u9031\u6570\u3092\u8a08\u7b97\u3059\u308b\u95a2\u6570<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3092\u53c2\u8003\u306b\u3055\u305b\u3066\u9802\u304d\u307e\u3057\u305f\u3002\n<a href=\"http:\/\/opentechnica.blogspot.jp\/2012\/03\/javascript.html\" target=\"_blank\" rel=\"noreferrer noopener\">Javascript\u3067\u5e74\u521d\u304b\u3089\u306e\u65e5\u6570\uff0f\u9031\u6570\u3092\u53d6\u5f97\u3059\u308b<\/a>\n<\/pre>\n\n\n[javascript]\n\/**<br \/>\n* \u5e74\u521d\u304b\u3089\u306e\u65e5\u6570\u3092\u53d6\u5f97<br \/>\n* 1\u67081\u65e5\u30921\u65e5\u76ee\u3068\u3059\u308b<br \/>\n*\/<br \/>\nfunction getDayOfYear(source) {<br \/>\nvar date = new Date(source);<br \/>\ndate.setHours(9); \/\/ \u7e70\u308a\u4e0a\u3052\u7528<\/p>\n<p>\/\/ \u5bfe\u8c61\u5e74\u306e1\u67081\u65e5<br \/>\nvar january_1 = new Date(date.getFullYear(), 0, 1);<\/p>\n<p>\/\/ \u5bfe\u8c61\u306e\u5e74\u6708\u65e5\u304b\u3089\u540c\u5e741\u67081\u65e5\u3092\u5f15\u3044\u305f\u5024 \u306e\u65e5\u8868\u8a18(86400000 = 24h * 60m * 60s * 1000ms) \u5207\u308a\u4e0a\u3052<br \/>\nreturn Math.ceil((date &#8211; january_1) \/ 86400000);<br \/>\n};<\/p>\n<p>\/**<br \/>\n* \u5e74\u521d\u304b\u3089\u306e\u9031\u6570\u3092\u53d6\u5f97<br \/>\n*\/<br \/>\nfunction getWeekOfYear(source) {<br \/>\nvar date = new Date(source);<\/p>\n<p>\/\/ \u5bfe\u8c61\u5e74\u306e1\u67081\u65e5\u3092\u53d6\u5f97<br \/>\nvar january_1 = new Date(date.getFullYear(), 0, 1);<\/p>\n<p>\/\/ \u5e74\u521d\u304b\u3089\u306e\u65e5\u6570<br \/>\nvar dayOfYear = getDayOfYear(source);<\/p>\n<p>\/\/ 1\u67081\u65e5\u306e\u9031\u30920\u9031\u76ee\u3001\u7fcc\u65e5\u66dc\u306e\u9031\u30921\u9031\u76ee\u3068\u306a\u308b\u8a08\u7b97\u306b\u3059\u308b\u305f\u3081\u3001\u65e5\u306b\u3061\u3092\u305a\u3089\u3059<br \/>\n\/\/ Date.getDay() \u2192 \u65e5:0\u3001\u6708:1\u3001\u706b:2\u3001\u6c34:3\u3001\u6728:4\u3001\u91d1:5\u3001\u571f:6<br \/>\nvar offset = january_1.getDay() &#8211; 1;<\/p>\n<p>\/\/ \u9031\u6570\u3092\u8a08\u7b97<br \/>\nvar weeks = Math.floor((dayOfYear + offset) \/ 7);<\/p>\n<p>\/\/ 1\u67081\u65e5\u306e\u9031\u3092\u7b2c1\u9031\u3068\u6570\u3048\u308b\u5834\u5408\u306f\u52a0\u7b97\u3059\u308b<br \/>\nif (isFirstWeek(january_1)) {<br \/>\nweeks += 1;<br \/>\n}<br \/>\nreturn weeks;<br \/>\n};<\/p>\n<p>\/**<br \/>\n* 1\u67081\u65e5\u304c1\u9031\u76ee\u3067\u3042\u308b\u304b\u5224\u5b9a\u3059\u308b<br \/>\n* \u9031\u306e\u59cb\u307e\u308a\u306f\u65e5\u66dc\u3068\u3059\u308b<br \/>\n*\/<br \/>\nfunction isFirstWeek(january_1) {<\/p>\n<p>\/\/ \u6708\u66dc\u3092\u542b\u3080\u9031\u304c1\u9031\u76ee\uff081\u6708\u306e\u30cf\u30c3\u30d4\u30fc\u30de\u30f3\u30c7\u30fc\u3092\u8003\u616e\u3059\u308b\u305f\u3081\uff09\u203b\u3053\u308c\u3067\u5168\u3066\u306e\u6708\u3092\u5bfe\u5fdc\u51fa\u6765\u308b\u8a33\u3067\u306f\u7121\u3044<br \/>\nreturn (january_1.getDay() &lt;= 1)<\/p>\n<p>\/\/ \u3010\u4ee5\u4e0b\u53c2\u8003\u307e\u3067\u306b\u3011<br \/>\n\/\/ \u65e5\u66dc\u3092\u542b\u3080\u9031\u304c1\u9031\u76ee<br \/>\n\/\/return (january_1.getDay() &lt;= 0)<br \/>\n\/\/ \u672c\u5e74\u306e4\u65e5\u4ee5\u4e0a\u3092\u542b\u3080\u9031\u304c1\u9031\u76ee<br \/>\n\/\/return (january_1.getDay() &lt;= 3)<br \/>\n}<br \/>\n[\/javascript]\n\n\n\n<p>\u5185\u5bb9\u306f\u30b3\u30fc\u30c9\u5185\u30b3\u30e1\u30f3\u30c8\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002 Line:30\u306eoffset\u306e\u76ee\u7684\u3067\u3059\u304c\u3001\u6587\u7ae0\u3067\u306e\u8aac\u660e\u304c\u96e3\u3057\u304b\u3063\u305f\u306e\u3067\u56f3\u306b\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"506\" height=\"400\" src=\"https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1.png\" alt=\"\" class=\"wp-image-1234\" srcset=\"https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1.png 506w, https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1-300x237.png 300w\" sizes=\"(max-width: 506px) 100vw, 506px\" \/><\/figure>\n\n\n\n<p>\u3064\u307e\u308a\u3001\u305d\u306e\u9031\u306e\u3069\u306e\u65e5\u306b\u3061\u3067\u9031\u6570\u3092\u8a08\u7b97\u3057\u3066\u3082\u540c\u3058\u7d50\u679c\u3068\u306a\u308b\u3088\u3046\u306b\u3001\u65e5\u4ed8\u306e\u88dc\u6b63\u3092\u3057\u3066\u3044\u307e\u3059\u3002 1\u67081\u65e5\u3092\u542b\u3080\u9031\u3092\u7b2c1\u9031\u3068\u6570\u3048\u308b\u304b\u306f\u3001\u8003\u3048\u65b9\u306b\u3088\u308a\u5909\u308f\u308b\u306e\u3067\u5225\u95a2\u6570\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u3001\u52a0\u7b97\u3059\u308b\u3053\u3068\u306b\u3057\u3066\u307e\u3059\u3002 \u53c2\u8003\uff1a<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.6\/ja\/date-and-time-functions.html#function_week\" target=\"_blank\" rel=\"noreferrer noopener\">MySQL\u306eWEEK\u95a2\u6570<\/a><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u4e0a\u8a18\u9031\u6570\u3092\u4f7f\u3044\u3001\u904e\u53bb\u306e\u540c\u3058\u66dc\u65e5\u306e\u65e5\u3092\u8a08\u7b97\u3059\u308b\u95a2\u6570<\/li><\/ul>\n\n\n[javascript]\n\/\/ \u6e1b\u7b97\u3059\u308b\u65e5\u6570<br \/>\nvar SUBTRACT_DAYS_WEEK = 7;<br \/>\nvar SUBTRACT_DAYS_YEAR = SUBTRACT_DAYS_WEEK * 52;<\/p>\n<p>\/**<br \/>\n* \u540c\u3058\u66dc\u65e5\u306e\u904e\u53bb\u65e5\u4ed8\u3092\u53d6\u5f97<br \/>\n*\/<br \/>\nfunction getDateOfPastOfSameDayOfWeek(inputDate, inputYears) {<\/p>\n<p>\/\/ \u57fa\u6e96\u65e5 \u65e5\u4ed8\u53d6\u5f97<br \/>\nvar date = new Date(inputDate);<\/p>\n<p>\/\/ 1\u5e74\u305a\u3064\u8a08\u7b97\u3059\u308b<br \/>\nfor (var i = 0; i &lt; inputYears; i++) {<\/p>\n<p>\/\/ \u73fe\u5728\u306e\u65e5\u306e\u3001\u5e74\u521d\u304b\u3089\u306e\u9031\u6570\u3092\u7b97\u51fa\u3057\u3066\u304a\u304f<br \/>\nvar weekOfYear = getWeekOfYear(date);<\/p>\n<p>\/\/ \u73fe\u5728\u306e\u65e5\u304b\u3089\u300152\u9031\u9593\u5206\u5f15\u304f(364\u65e5\u3001\u524d\u5e74\u306e\u540c\u3058\u66dc\u65e5\u3068\u306a\u308b)<br \/>\nvar dayOfMonth = date.getDate();<br \/>\ndate.setDate(dayOfMonth &#8211; SUBTRACT_DAYS_YEAR);<\/p>\n<p>\/\/ \u524d\u5e74\u306e\u3001\u5e74\u521d\u304b\u3089\u306e\u9031\u6570\u3092\u7b97\u51fa<br \/>\nvar lastWeekOfYear = getWeekOfYear(date);<\/p>\n<p>\/\/ \u524d\u5e74\u306e\u9031\u6570\u304c\u7e70\u308a\u4e0a\u304c\u3063\u3066\u3044\u308b\u5834\u5408\u30011\u9031\u9593\u5206\u5f15\u304f<br \/>\nif (weekOfYear &lt; lastWeekOfYear) {<br \/>\ndate.setDate(date.getDate() &#8211; SUBTRACT_DAYS_WEEK);<br \/>\n}<br \/>\n\/\/ \u7b97\u51fa\u3057\u305f\u65e5\u3092\u57fa\u6e96\u3068\u3057\u3066\u3001\u6307\u5b9a\u5e74\u6570\u5206\u7e70\u308a\u8fd4\u3059<br \/>\n}<br \/>\nreturn date;<br \/>\n}<br \/>\n[\/javascript]\n\n\n\n<p>\u95a2\u6570\u540d\u306b\u3084\u305f\u3089Of\u304c\u4ed8\u3044\u3066\u9577\u304f\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002 \u52d5\u4f5c\u78ba\u8a8d\u7528\u306eHTML\u306f\u3053\u3061\u3089 \u2192<a href=\"http:\/\/labs.opentone.co.jp\/wp-content\/uploads\/2015\/11\/getDateOfPastOfSameDayOfWeek1.html\" target=\"_blank\" rel=\"noreferrer noopener\">getDateOfPastOfSameDayOfWeek1<\/a> \u4e0a\u8a18\u306f1\u5e74\u305a\u3064\u7e70\u308a\u4e0b\u3052\u3066\u3044\u304f\u5834\u5408\u3067\u4f5c\u6210\u3057\u307e\u3057\u305f\u304c\u3001\u5e74\u521d\u304b\u3089\u306e\u9031\u6570\u3068\u66dc\u65e5\u3092\u3082\u3068\u306b\u3001\u904e\u53bb\u5e74\u306e1\u67081\u65e5\u304b\u3089\u52a0\u7b97\u3057\u3066\u8a08\u7b97\u3057\u3066\u3044\u304f\u65b9\u6cd5\u3082\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n[javascript]\n\/**<br \/>\n* \t\u540c\u3058\u66dc\u65e5\u306e\u904e\u53bb\u65e5\u4ed8\u3092\u53d6\u5f97<br \/>\n*\/<br \/>\nfunction getDateOfPastOfSameDayOfWeek(inputDate, inputYears) {<\/p>\n<p>\/\/ \u57fa\u6e96\u65e5 \u65e5\u4ed8\u53d6\u5f97<br \/>\nvar date = new Date(inputDate);<br \/>\n\/\/ \u57fa\u6e96\u65e5\u306e\u3001\u5e74\u521d\u304b\u3089\u306e\u9031\u6570\u3092\u7b97\u51fa\u3057\u3066\u304a\u304f<br \/>\nvar weekOfYear = getWeekOfYear(date);<br \/>\n\/\/ \u73fe\u5728\u306e\u66dc\u65e5\u3092\u53d6\u5f97\u3057\u3066\u304a\u304f<br \/>\nvar day = date.getDay();<\/p>\n<p>\/\/ \u6307\u5b9a\u5e74\u6570\u524d\u306e1\u67081\u65e5\u3092\u53d6\u5f97<br \/>\nvar pastDate = new Date(date.getFullYear() &#8211; inputYears, 0, 1);<br \/>\n\/\/ 1\u67081\u65e5\u304c1\u9031\u76ee\u306e\u5834\u5408\u3001\u8a08\u7b97\u5f8c\u306b1\u9031\u9593\u5206\u5f15\u304f<br \/>\nvar sub = 0;<br \/>\nif (isFirstWeek(pastDate)) {<br \/>\nsub = 7;<br \/>\n}<br \/>\n\/\/ 1\u67081\u65e5\u3092\u65e5\u66dc\u306b\u3059\u308b(\u5143\u3005\u65e5\u66dc\u3067\u3042\u3063\u3066\u3082\u30011\u9031\u9593\u305a\u308c\u308b)<br \/>\npastDate.setDate(pastDate.getDate() + (7 &#8211; pastDate.getDay()))<\/p>\n<p>\/\/ \u57fa\u6e96\u65e5\u3068\u540c\u3058\u9031\u6570\u3001\u66dc\u65e5\u306b\u306a\u308b\u3088\u3046\u52a0\u7b97\u3059\u308b<br \/>\npastDate.setDate(pastDate.getDate() + ((weekOfYear &#8211; 1)  * 7) + day &#8211; sub);<\/p>\n<p>return pastDate;<br \/>\n}<br \/>\n[\/javascript]\n\n\n\n<p>\u52d5\u4f5c\u78ba\u8a8d\u7528\u306eHTML\u306f\u3053\u3061\u3089 \u2192<a href=\"http:\/\/labs.opentone.co.jp\/wp-content\/uploads\/2015\/11\/getDateOfPastOfSameDayOfWeek2.html\" target=\"_blank\" rel=\"noreferrer noopener\">getDateOfPastOfSameDayOfWeek2<\/a> \u5e74\u521d\u304b\u3089\u306e\u9031\u6570\u3067\u5224\u5b9a\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u500b\u3005\u306e\u6708\u3067\u306e\u7b2c\u4f55\u9031\u304b\u306f\u8003\u616e\u3057\u3066\u3044\u307e\u305b\u3093\u3002 \u306a\u306e\u3067\u3001\u5192\u982d\u3067\u89e6\u308c\u305f\u3088\u3046\u306a2015\u5e749\u670821\u65e5(\u656c\u8001\u306e\u65e5)\u3067\u306f\u3001 2015\u5e749\u670821\u65e5\uff1a38\u9031\u76ee\u30019\u6708\u7b2c3\u6708\u66dc 2014\u5e749\u670822\u65e5\uff1a38\u9031\u76ee\u30019\u6708\u7b2c4\u6708\u66dc \u3068\u306a\u308a\u3001\u6642\u671f\u3068\u3057\u3066\u306f\u5408\u3063\u3066\u307e\u3059\u304c\u3001\u795d\u65e5\u3068\u3057\u3066\u306f\u30ba\u30ec\u3066\u3057\u307e\u3044\u307e\u3059\u3002 \u3053\u3046\u3044\u3063\u305f\u8981\u4ef6\u3067\u5bfe\u5fdc\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u6708\u5358\u4f4d\u3067\u5bfe\u5fdc\u3059\u308b\u7bc4\u56f2\u3092\u56fa\u5b9a\u3057\u305f\u4e0a\u3067\u3001\u30ed\u30b8\u30c3\u30af\u3092\u7d44\u3080\u5fc5\u8981\u304c\u3042\u308b\u3067\u3057\u3087\u3046\u3002 \u203b9\u6708\u306e\u7b2c3\u6708\u66dc\u3092\u3001\u904e\u53bb\u4f55\u5e74\u5206\u7b97\u51fa\u3059\u308b\u2026\u307f\u305f\u3044\u306a * \u30aa\u30de\u30b1 Java\u3067\u4f55\u304b\u4fbf\u5229\u306a\u3082\u306e\u306a\u3044\u304b\u306a\u30fc\u3068\u601d\u3063\u3066\u8abf\u3079\u3066\u307f\u305f\u6642\u306b\u3001\u898b\u3064\u3051\u3066\u8a66\u3057\u305f\u3082\u306e\u3067\u3059\u3002 [java] package jo.co.opentone.tk; import java.time.DayOfWeek; import java.time.LocalDate; import java.time.format.DateTimeFormatter; import java.time.format.DateTimeFormatterBuilder; import java.time.temporal.WeekFields; public class Main { public static void main(String[] args) { WeekFields week = WeekFields.of(DayOfWeek.SUNDAY, 1); DateTimeFormatter dtf = new DateTimeFormatterBuilder() .appendPattern(&#8220;yyyy\/MM\/dd(E) &#8220;) .appendValue(week.weekOfYear()) .appendLiteral(&#8220;\u9031\u76ee&#8221;) .toFormatter(); LocalDate date = LocalDate.of(2015, 11, 1); System.out.println(date.format(dtf)); } } \u51fa\u529b 2015\/11\/01(\u65e5) 45\u9031\u76ee [\/java]\n\n\n\n<p>\u53c2\u8003\uff1a<br><a href=\"http:\/\/qiita.com\/tag1216\/items\/9cb33a39a6666983491d\" target=\"_blank\" rel=\"noreferrer noopener\">Java8\u65e5\u6642API\u306e\u3061\u3087\u3063\u3068\u7279\u6b8a\u306a\u30af\u30e9\u30b9\u305f\u3061<\/a><br><a href=\"http:\/\/docs.oracle.com\/javase\/jp\/8\/api\/java\/time\/temporal\/WeekFields.html\" target=\"_blank\" rel=\"noreferrer noopener\">WeekFields<\/a><\/p>\n<div class=\"opent-_2\" style=\"margin-top: 10px;margin-right: 10px;margin-bottom: 10px;margin-left: 10px;\" id=\"opent-52676499\"><a href=\"https:\/\/www.opentone.co.jp\/backlog\/\" aria-label=\"twitter_backlogskt_new\"><img src=\"https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2023\/02\/twitter_backlogskt_new.jpg\" alt=\"\"  srcset=\"https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2023\/02\/twitter_backlogskt_new.jpg 1024w, https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2023\/02\/twitter_backlogskt_new-300x157.jpg 300w, https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2023\/02\/twitter_backlogskt_new-768x401.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" width=\"384\" height=\"200\"   \/><\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3002kk\u3067\u3059\u3002 \uff5e\u4f8b\u3048\u3070\u3053\u3093\u306a\u30b7\u30c1\u30e5\u30a8\u30fc\u30b7\u30e7\u30f3\uff5e \u4eca\u5e74\u306e\u6765\u5834\u8005\u6570\u306e\u63a8\u79fb\u3092\u5206\u6790\u3057\u3066\u3044\u307e\u3059\u3002\u3084\u306f<\/p>\n","protected":false},"author":1,"featured_media":1234,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[28],"tags":[14],"class_list":["post-1233","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-web-system","tag-html5javascript",""],"acf":[],"aioseo_notices":[],"uagb_featured_image_src":{"full":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1.png",506,400,false],"thumbnail":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1-150x150.png",150,150,true],"medium":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1-300x237.png",300,237,true],"medium_large":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1.png",506,400,false],"large":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1.png",506,400,false],"1536x1536":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1.png",506,400,false],"2048x2048":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1.png",506,400,false],"engage-mag-carousel-img":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1.png",506,400,false],"engage-mag-carousel-img-landscape":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1-506x225.png",506,225,true],"engage-mag-carousel-large-img":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1.png",506,400,false],"engage-mag-carousel-large-img-landscape":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1-506x287.png",506,287,true],"engage-mag-large-thumb":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1.png",506,400,false],"engage-mag-small-thumb":["https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/6778_1-350x220.png",350,220,true]},"uagb_author_info":{"display_name":"ah106rx4o4","author_link":"https:\/\/www.opentone.co.jp\/ot-lab\/author\/ah106rx4o4"},"uagb_comment_info":0,"uagb_excerpt":"\u3053\u3093\u306b\u3061\u306f\u3002kk\u3067\u3059\u3002 \uff5e\u4f8b\u3048\u3070\u3053\u3093\u306a\u30b7\u30c1\u30e5\u30a8\u30fc\u30b7\u30e7\u30f3\uff5e 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