{"id":3395,"date":"2025-03-24T08:46:18","date_gmt":"2025-03-23T23:46:18","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=3395"},"modified":"2025-03-24T08:46:49","modified_gmt":"2025-03-23T23:46:49","slug":"%e3%80%90%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%e3%80%91php%e3%81%aedate%e9%96%a2%e6%95%b0%e3%81%a7%e6%97%a5%e4%bb%98%e5%87%a6%e7%90%86%e3%82%92%e6%a5%b5%e3%82%81%e3%82%8b%ef%bc%81%e5%ae%9f","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=3395","title":{"rendered":"\u3010\u5b8c\u5168\u30ac\u30a4\u30c9\u3011PHP\u306edate\u95a2\u6570\u3067\u65e5\u4ed8\u51e6\u7406\u3092\u6975\u3081\u308b\uff01\u5b9f\u8df5\u7684\u306a12\u306e\u4f7f\u3044\u65b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">PHP\u306edate\u95a2\u6570\u3068\u306f\uff1f\u57fa\u790e\u304b\u3089\u5b8c\u5168\u306b\u7406\u89e3\u3059\u308b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">date\u95a2\u6570\u306e\u57fa\u672c\u69cb\u6587\u3068\u4e3b\u8981\u30d1\u30e9\u30e1\u30fc\u30bf<\/a>      <\/li>      <li>        <a href=\"#i-2\">\u5f62\u5f0f\u6587\u5b57\u5217\u306e\u30de\u30b9\u30bf\u30fc\u8853<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-3\">\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3068\u65e5\u4ed8\u6587\u5b57\u5217\u306e\u9055\u3044<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-4\">\u5b9f\u8df5\u3067\u4f7f\u3048\u308bPHP\u6642\u523b\u51e6\u7406\u6280\u8853<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-5\">\u73fe\u5728\u65e5\u6642\u306e\u53d6\u5f97\u3068\u8868\u793a\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b<\/a>      <\/li>      <li>        <a href=\"#i-6\">\u65e5\u4ed8\u306e\u8a08\u7b97\u3068\u6bd4\u8f03\u3092\u7c21\u5358\u306b\u884c\u3046<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-7\">\u548c\u66a6\u3078\u306e\u5909\u63db\u3068\u65e5\u672c\u8a9e\u3067\u306e\u65e5\u4ed8\u8868\u793a<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-8\">\u56f0\u3063\u305f\u3068\u304d\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-9\">\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306b\u95a2\u3059\u308b\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/a>      <\/li>      <li>        <a href=\"#i-10\">\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-11\">PHP\u30d0\u30fc\u30b8\u30e7\u30f3\u9593\u3067\u306e\u4e92\u63db\u6027\u306e\u6ce8\u610f\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-12\">date\u95a2\u6570\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u4ee3\u66ff\u624b\u6bb5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-13\">DateTime\u30af\u30e9\u30b9\u3068\u306e\u5229\u7528<\/a>      <\/li>      <li>        <a href=\"#i-14\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3068\u5165\u529b\u5024\u306e\u691c\u8a3c<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-16\">\u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u30b5\u30f3\u30d7\u30eb\u3068\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">\u4e88\u7d04\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u65e5\u4ed8\u51e6\u7406\u306e\u5b9f\u8df5\u4f8b<\/a>      <\/li>      <li>        <a href=\"#i-18\">\u30ed\u30b0\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3068\u306e\u9023\u643a\u306b\u304a\u3051\u308b\u65e5\u4ed8\u51e6\u7406<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">PHP\u306edate\u95a2\u6570\u3068\u306f\uff1f\u57fa\u790e\u304b\u3089\u5b8c\u5168\u306b\u7406\u89e3\u3059\u308b<\/h2>\n\n\n\n<p>PHP\u306edate\u95a2\u6570\u306f\u3001\u65e5\u4ed8\u3068\u6642\u523b\u3092\u6271\u3046\u305f\u3081\u306e\u6700\u3082\u57fa\u672c\u7684\u306a\u95a2\u6570\u306e1\u3064\u3067\u3059\u3002\u3053\u306e\u95a2\u6570\u3092\u4f7f\u3044\u3053\u306a\u3059\u3053\u3068\u3067\u3001Web\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3051\u308b\u65e5\u4ed8\u51e6\u7406\u3092\u52b9\u7387\u7684\u306b\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">date\u95a2\u6570\u306e\u57fa\u672c\u69cb\u6587\u3068\u4e3b\u8981\u30d1\u30e9\u30e1\u30fc\u30bf<\/h3>\n\n\n\n<p>date\u95a2\u6570\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">string date ( string $format [, int $timestamp = time() ] )\n<\/pre>\n\n\n\n<p>\u4e3b\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u8aac\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>$format<\/code>: \u65e5\u4ed8\u306e\u51fa\u529b\u5f62\u5f0f\u3092\u6307\u5b9a\u3059\u308b\u6587\u5b57\u5217<\/li>\n\n\n\n<li><code>$timestamp<\/code>: UNIX\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\uff08\u7701\u7565\u53ef\u80fd\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u73fe\u5728\u306e\u65e5\u4ed8\u3092\u300c2024-03-05\u300d\u5f62\u5f0f\u3067\u53d6\u5f97\n$today = date('Y-m-d');\n\n\/\/ \u73fe\u5728\u306e\u6642\u523b\u3092\u300c14:30:45\u300d\u5f62\u5f0f\u3067\u53d6\u5f97\n$time = date('H:i:s');\n\n\/\/ \u65e5\u4ed8\u3068\u6642\u523b\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u53d6\u5f97\n$datetime = date('Y-m-d H:i:s');\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u5f62\u5f0f\u6587\u5b57\u5217\u306e\u30de\u30b9\u30bf\u30fc\u8853<\/h3>\n\n\n\n<p>date\u95a2\u6570\u306e\u5f62\u5f0f\u6587\u5b57\u5217\u3067\u4f7f\u7528\u3067\u304d\u308b\u4e3b\u8981\u306a\u6587\u5b57\u3068\u305d\u306e\u610f\u5473\u3092\u8868\u306b\u307e\u3068\u3081\u307e\u3057\u305f\uff1a<\/p>\n\n\n<div id=\"id-80398000-ddfc-4116-a449-2cb88364ecc5\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6587\u5b57<\/th><th>\u8aac\u660e<\/th><th>\u4f8b<\/th><\/tr><\/thead><tbody><tr><td>Y<\/td><td>4\u6841\u306e\u5e74<\/td><td>2024<\/td><\/tr><tr><td>y<\/td><td>2\u6841\u306e\u5e74<\/td><td>24<\/td><\/tr><tr><td>m<\/td><td>2\u6841\u306e\u6708<\/td><td>01-12<\/td><\/tr><tr><td>n<\/td><td>1-2\u6841\u306e\u6708<\/td><td>1-12<\/td><\/tr><tr><td>d<\/td><td>2\u6841\u306e\u65e5<\/td><td>01-31<\/td><\/tr><tr><td>j<\/td><td>1-2\u6841\u306e\u65e5<\/td><td>1-31<\/td><\/tr><tr><td>H<\/td><td>24\u6642\u9593\u5f62\u5f0f\u306e\u6642\u9593\uff082\u6841\uff09<\/td><td>00-23<\/td><\/tr><tr><td>h<\/td><td>12\u6642\u9593\u5f62\u5f0f\u306e\u6642\u9593\uff082\u6841\uff09<\/td><td>01-12<\/td><\/tr><tr><td>i<\/td><td>\u5206\uff082\u6841\uff09<\/td><td>00-59<\/td><\/tr><tr><td>s<\/td><td>\u79d2\uff082\u6841\uff09<\/td><td>00-59<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u69d8\u3005\u306a\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u4f8b\n$formats = [\n    'Y-m-d' =&gt; date('Y-m-d'),     \/\/ 2024-03-05\n    'd\/m\/Y' =&gt; date('d\/m\/Y'),     \/\/ 05\/03\/2024\n    'Y\u5e74m\u6708d\u65e5' =&gt; date('Y\u5e74m\u6708d\u65e5'), \/\/ 2024\u5e7403\u670805\u65e5\n    'D M j' =&gt; date('D M j'),     \/\/ Tue Mar 5\n    'l jS F Y' =&gt; date('l jS F Y') \/\/ Tuesday 5th March 2024\n];\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3068\u65e5\u4ed8\u6587\u5b57\u5217\u306e\u9055\u3044<\/h3>\n\n\n\n<p>PHP\u306b\u304a\u3051\u308b\u65e5\u4ed8\u51e6\u7406\u3067\u91cd\u8981\u306a\u306e\u304c\u3001\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3068\u65e5\u4ed8\u6587\u5b57\u5217\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>UNIX\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7<\/strong>\n<ul class=\"wp-block-list\">\n<li>1970\u5e741\u67081\u65e5\u304b\u3089\u306e\u7d4c\u904e\u79d2\u6570<\/li>\n\n\n\n<li>\u6574\u6570\u5024\u3068\u3057\u3066\u6271\u308f\u308c\u308b<\/li>\n\n\n\n<li>\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306b\u4f9d\u5b58\u3057\u306a\u3044<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u73fe\u5728\u306e\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3092\u53d6\u5f97\n$timestamp = time();\n\n\/\/ \u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u304b\u3089\u65e5\u4ed8\u3092\u751f\u6210\n$date = date('Y-m-d H:i:s', $timestamp);\n\n\/\/ \u7279\u5b9a\u306e\u65e5\u6642\u306e\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3092\u4f5c\u6210\n$custom_timestamp = mktime(14, 30, 0, 3, 5, 2024);  \/\/ 2024-03-05 14:30:00\n<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u65e5\u4ed8\u6587\u5b57\u5217<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4eba\u9593\u304c\u8aad\u307f\u3084\u3059\u3044\u5f62\u5f0f<\/li>\n\n\n\n<li>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u306e\u4fdd\u5b58\u306b\u9069\u3057\u3066\u3044\u308b<\/li>\n\n\n\n<li>\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u5f71\u97ff\u3092\u53d7\u3051\u308b<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u65e5\u4ed8\u6587\u5b57\u5217\u304b\u3089\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3092\u751f\u6210\n$date_string = '2024-03-05 14:30:00';\n$timestamp = strtotime($date_string);\n\n\/\/ \u76f8\u5bfe\u7684\u306a\u65e5\u4ed8\u6587\u5b57\u5217\u3082\u4f7f\u7528\u53ef\u80fd\n$tomorrow = date('Y-m-d', strtotime('tomorrow'));\n$next_week = date('Y-m-d', strtotime('+1 week'));\n<\/pre>\n\n\n\n<p>PHP\u306e\u65e5\u4ed8\u51e6\u7406\u306b\u304a\u3044\u3066\u3001\u3053\u308c\u3089\u306e\u57fa\u672c\u6982\u5ff5\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u77e5\u8b58\u3092\u57fa\u306b\u3001\u3088\u308a\u8907\u96d1\u306a\u65e5\u4ed8\u51e6\u7406\u3084\u3001\u5b9f\u969b\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u3067\u306e\u5fdc\u7528\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-4\">\u5b9f\u8df5\u3067\u4f7f\u3048\u308bPHP\u6642\u523b\u51e6\u7406\u6280\u8853<\/h2>\n\n\n\n<p>\u5b9f\u969b\u306eWeb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u3067\u306f\u3001\u5358\u7d14\u306a\u65e5\u4ed8\u8868\u793a\u3060\u3051\u3067\u306a\u304f\u3001\u69d8\u3005\u306a\u65e5\u4ed8\u51e6\u7406\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u5b9f\u8df5\u7684\u306a\u65e5\u4ed8\u51e6\u7406\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u73fe\u5728\u65e5\u6642\u306e\u53d6\u5f97\u3068\u8868\u793a\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b<\/h3>\n\n\n\n<p>\u73fe\u5728\u65e5\u6642\u306e\u53d6\u5f97\u3068\u8868\u793a\u306f\u3001\u591a\u304f\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u5fc5\u8981\u3068\u306a\u308b\u57fa\u672c\u7684\u306a\u6a5f\u80fd\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u5b9f\u8df5\u7684\u306a\u4f8b\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u65e5\u672c\u8a9e\u306e\u66dc\u65e5\u3092\u8868\u793a\u3059\u308b\nfunction getJapaneseDayOfWeek($date) {\n    $weekday = date('w', strtotime($date));\n    $weekdays = ['\u65e5', '\u6708', '\u706b', '\u6c34', '\u6728', '\u91d1', '\u571f'];\n    return $weekdays[$weekday];\n}\n\n\/\/ \u73fe\u5728\u306e\u65e5\u6642\u3092\u65e5\u672c\u8a9e\u5f62\u5f0f\u3067\u8868\u793a\n$today = date('Y\u5e74m\u6708d\u65e5');\n$weekday = getJapaneseDayOfWeek(date('Y-m-d'));\n$time = date('H\u6642i\u5206');\n\necho \"{$today}\uff08{$weekday}\uff09{$time}\"; \/\/ \u4f8b\uff1a2024\u5e7403\u670805\u65e5\uff08\u706b\uff0914\u664230\u5206\n\n\/\/ \u6642\u9593\u5e2f\u306b\u5fdc\u3058\u3066\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u5909\u66f4\nfunction getTimeBasedGreeting() {\n    $hour = (int)date('H');\n    if ($hour &gt;= 5 &amp;&amp; $hour &lt; 12) {\n        return '\u304a\u306f\u3088\u3046\u3054\u3056\u3044\u307e\u3059';\n    } elseif ($hour &gt;= 12 &amp;&amp; $hour &lt; 18) {\n        return '\u3053\u3093\u306b\u3061\u306f';\n    } else {\n        return '\u3053\u3093\u3070\u3093\u306f';\n    }\n}\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u65e5\u4ed8\u306e\u8a08\u7b97\u3068\u6bd4\u8f03\u3092\u7c21\u5358\u306b\u884c\u3046<\/h3>\n\n\n\n<p>\u65e5\u4ed8\u306e\u8a08\u7b97\u3084\u6bd4\u8f03\u306f\u3001\u4e88\u7d04\u30b7\u30b9\u30c6\u30e0\u3084\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u7ba1\u7406\u306a\u3069\u3067\u983b\u7e41\u306b\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u65e5\u4ed8\u306e\u52a0\u7b97\u30fb\u6e1b\u7b97\nfunction addDaysToDate($date, $days) {\n    return date('Y-m-d', strtotime(\"{$date} {$days} days\"));\n}\n\n\/\/ \u671f\u9650\u5207\u308c\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\nfunction isExpired($deadline) {\n    $current = time();\n    $deadlineTime = strtotime($deadline);\n    return $current &gt; $deadlineTime;\n}\n\n\/\/ \u65e5\u4ed8\u306e\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\nfunction isDateInRange($date, $start, $end) {\n    $dateTime = strtotime($date);\n    $startTime = strtotime($start);\n    $endTime = strtotime($end);\n    return ($dateTime &gt;= $startTime &amp;&amp; $dateTime &lt;= $endTime);\n}\n\n\/\/ \u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\n$order_date = '2024-03-05';\n$delivery_date = addDaysToDate($order_date, 3);  \/\/ 3\u65e5\u5f8c\u306e\u914d\u9001\u65e5\n$warranty_end = addDaysToDate($order_date, 365); \/\/ 1\u5e74\u9593\u306e\u4fdd\u8a3c\u671f\u9650\n\n\/\/ \u671f\u9650\u5207\u308c\u5546\u54c1\u306e\u30c1\u30a7\u30c3\u30af\n$products = [\n    ['name' =&gt; '\u5546\u54c1A', 'expiry' =&gt; '2024-03-10'],\n    ['name' =&gt; '\u5546\u54c1B', 'expiry' =&gt; '2024-03-01']\n];\n\nforeach ($products as $product) {\n    if (isExpired($product['expiry'])) {\n        echo \"{$product['name']}\u306f\u671f\u9650\u5207\u308c\u3067\u3059\u3002\\n\";\n    }\n}\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u548c\u66a6\u3078\u306e\u5909\u63db\u3068\u65e5\u672c\u8a9e\u3067\u306e\u65e5\u4ed8\u8868\u793a<\/h3>\n\n\n\n<p>\u65e5\u672c\u306e\u30d3\u30b8\u30cd\u30b9\u74b0\u5883\u3067\u306f\u548c\u66a6\u8868\u793a\u304c\u6c42\u3081\u3089\u308c\u308b\u3053\u3068\u3082\u591a\u3044\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5b9f\u88c5\u304c\u5f79\u7acb\u3061\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">function convertToJapaneseEra($date) {\n    $timestamp = strtotime($date);\n    $year = date('Y', $timestamp);\n    $month = date('n', $timestamp);\n    $day = date('j', $timestamp);\n    \n    \/\/ \u4ee4\u548c\u958b\u59cb\u65e5: 2019\u5e745\u67081\u65e5\n    if ($timestamp &gt;= strtotime('2019-05-01')) {\n        $era = '\u4ee4\u548c';\n        $year = $year - 2018;\n    }\n    \/\/ \u5e73\u6210\u958b\u59cb\u65e5: 1989\u5e741\u67088\u65e5\n    elseif ($timestamp &gt;= strtotime('1989-01-08')) {\n        $era = '\u5e73\u6210';\n        $year = $year - 1988;\n    }\n    \/\/ \u305d\u308c\u4ee5\u524d\u306f\u662d\u548c\u3068\u3059\u308b\uff08\u7c21\u7565\u5316\uff09\n    else {\n        $era = '\u662d\u548c';\n        $year = $year - 1925;\n    }\n    \n    return sprintf('%s%d\u5e74%d\u6708%d\u65e5', $era, $year, $month, $day);\n}\n\n\/\/ \u65e5\u672c\u8a9e\u306e\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u751f\u6210\u3059\u308b\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\nclass JapaneseDateFormatter {\n    private $timestamp;\n    \n    public function __construct($date = 'now') {\n        $this-&gt;timestamp = strtotime($date);\n    }\n    \n    public function getFullDate() {\n        $date = date('Y\u5e74m\u6708d\u65e5', $this-&gt;timestamp);\n        $weekday = $this-&gt;getJapaneseDayOfWeek();\n        return \"{$date}\uff08{$weekday}\uff09\";\n    }\n    \n    public function getJapaneseDayOfWeek() {\n        $weekday = date('w', $this-&gt;timestamp);\n        $weekdays = ['\u65e5', '\u6708', '\u706b', '\u6c34', '\u6728', '\u91d1', '\u571f'];\n        return $weekdays[$weekday];\n    }\n    \n    public function getEraDate() {\n        return convertToJapaneseEra(date('Y-m-d', $this-&gt;timestamp));\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\n$formatter = new JapaneseDateFormatter('2024-03-05');\necho $formatter-&gt;getFullDate(); \/\/ 2024\u5e7403\u670805\u65e5\uff08\u706b\uff09\necho $formatter-&gt;getEraDate(); \/\/ \u4ee4\u548c6\u5e743\u67085\u65e5\n<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u88c5\u4f8b\u306f\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3050\u306b\u6d3b\u7528\u3067\u304d\u308b\u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u3067\u3059\u3002\u65e5\u4ed8\u51e6\u7406\u306f\u591a\u304f\u306eWeb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3059\u305f\u3081\u3001\u3053\u308c\u3089\u306e\u57fa\u672c\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u3092\u62bc\u3055\u3048\u3066\u304a\u304f\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u306a\u958b\u767a\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-8\">\u56f0\u3063\u305f\u3068\u304d\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/h2>\n\n\n\n<p>PHP \u306e\u65e5\u4ed8\u51e6\u7406\u3067\u767a\u751f\u3057\u3084\u3059\u3044\u554f\u984c\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u5b9f\u8df5\u7684\u306a\u5bfe\u51e6\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306b\u95a2\u3059\u308b\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/h3>\n\n\n\n<p>\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u8a2d\u5b9a\u30df\u30b9\u306f\u3001\u591a\u304f\u306e\u30d0\u30b0\u306e\u539f\u56e0\u3068\u306a\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4e3b\u306a\u554f\u984c\u3068\u89e3\u6c7a\u7b56\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u95a2\u9023\u306e\u554f\u984c\u3092\u9632\u3050\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\nclass TimeZoneHandler {\n    public static function initialize() {\n        \/\/ \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u59cb\u6642\u306b\u30c7\u30d5\u30a9\u30eb\u30c8\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u3092\u8a2d\u5b9a\n        date_default_timezone_set('Asia\/Tokyo');\n        \n        \/\/ \u73fe\u5728\u306e\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u8a2d\u5b9a\u3092\u78ba\u8a8d\n        $current_timezone = date_default_timezone_get();\n        error_log(\"Current timezone: \" . $current_timezone);\n    }\n    \n    public static function convertToUserTimezone($datetime, $user_timezone) {\n        try {\n            $date = new DateTime($datetime);\n            $date-&gt;setTimezone(new DateTimeZone($user_timezone));\n            return $date-&gt;format('Y-m-d H:i:s');\n        } catch (Exception $e) {\n            error_log(\"Timezone conversion error: \" . $e-&gt;getMessage());\n            return false;\n        }\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nTimeZoneHandler::initialize();\n\n\/\/ \u30e6\u30fc\u30b6\u30fc\u306e\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306b\u5909\u63db\n$tokyo_time = '2024-03-05 15:00:00';\n$user_timezone = 'America\/New_York';\n$converted_time = TimeZoneHandler::convertToUserTimezone($tokyo_time, $user_timezone);\n<\/pre>\n\n\n\n<p>\u3088\u304f\u3042\u308b\u554f\u984c\u3068\u5bfe\u7b56\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b5\u30fc\u30d0\u30fc\u3068\u30ed\u30fc\u30ab\u30eb\u306e\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u4e0d\u4e00\u81f4\n<ul class=\"wp-block-list\">\n<li>PHP.ini\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u3092\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u8d77\u52d5\u6642\u306b\u660e\u793a\u7684\u306b\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u3092\u8a2d\u5b9a<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u590f\u6642\u9593\u306e\u5207\u308a\u66ff\u308f\u308a\u306b\u3088\u308b\u554f\u984c\n<ul class=\"wp-block-list\">\n<li>DateTime\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u81ea\u52d5\u7684\u306b\u51e6\u7406<\/li>\n\n\n\n<li>\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3092\u4f7f\u7528\u3057\u3066\u8a08\u7b97\u3092\u884c\u3046<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u5165\u529b\u3055\u308c\u305f\u65e5\u4ed8\u304c\u6b63\u3057\u3044\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DateValidator {\n    \/**\n     * \u65e5\u4ed8\u6587\u5b57\u5217\u304c\u6709\u52b9\u304b\u3069\u3046\u304b\u3092\u691c\u8a3c\n     * @param string $date \u691c\u8a3c\u3059\u308b\u65e5\u4ed8\u6587\u5b57\u5217\n     * @param string $format \u671f\u5f85\u3059\u308b\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\n     * @return bool\n     *\/\n    public static function isValidDate($date, $format = 'Y-m-d') {\n        $d = DateTime::createFromFormat($format, $date);\n        return $d &amp;&amp; $d-&gt;format($format) === $date;\n    }\n    \n    \/**\n     * \u65e5\u4ed8\u306e\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\n     * @param string $date \u30c1\u30a7\u30c3\u30af\u3059\u308b\u65e5\u4ed8\n     * @param string $start \u958b\u59cb\u65e5\n     * @param string $end \u7d42\u4e86\u65e5\n     * @return bool\n     *\/\n    public static function isDateInRange($date, $start, $end) {\n        try {\n            $check_date = new DateTime($date);\n            $start_date = new DateTime($start);\n            $end_date = new DateTime($end);\n            \n            return $check_date &gt;= $start_date &amp;&amp; $check_date &lt;= $end_date;\n        } catch (Exception $e) {\n            error_log(\"Date range validation error: \" . $e-&gt;getMessage());\n            return false;\n        }\n    }\n    \n    \/**\n     * \u69d8\u3005\u306a\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u6a19\u6e96\u5f62\u5f0f\u306b\u5909\u63db\n     * @param string $date \u5909\u63db\u3059\u308b\u65e5\u4ed8\u6587\u5b57\u5217\n     * @return string|false\n     *\/\n    public static function normalizeDate($date) {\n        \/\/ \u4e00\u822c\u7684\u306a\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u8a66\u884c\n        $formats = [\n            'Y\/m\/d',\n            'd-m-Y',\n            'Y.m.d',\n            'Y\u5e74m\u6708d\u65e5'\n        ];\n        \n        foreach ($formats as $format) {\n            $d = DateTime::createFromFormat($format, $date);\n            if ($d !== false) {\n                return $d-&gt;format('Y-m-d');\n            }\n        }\n        \n        return false;\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\n$validator = new DateValidator();\n\n\/\/ \u65e5\u4ed8\u306e\u59a5\u5f53\u6027\u30c1\u30a7\u30c3\u30af\n$test_dates = [\n    '2024-02-29',  \/\/ \u3046\u308b\u3046\u5e74\u306e\u6b63\u3057\u3044\u65e5\u4ed8\n    '2024-02-30',  \/\/ \u7121\u52b9\u306a\u65e5\u4ed8\n    '2024\/03\/05',  \/\/ \u7570\u306a\u308b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\n];\n\nforeach ($test_dates as $date) {\n    if (DateValidator::isValidDate($date)) {\n        echo \"{$date} \u306f\u6709\u52b9\u306a\u65e5\u4ed8\u3067\u3059\u3002\\n\";\n    } else {\n        echo \"{$date} \u306f\u7121\u52b9\u306a\u65e5\u4ed8\u3067\u3059\u3002\\n\";\n    }\n}\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">PHP\u30d0\u30fc\u30b8\u30e7\u30f3\u9593\u3067\u306e\u4e92\u63db\u6027\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<p>PHP\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u3088\u3063\u3066\u65e5\u4ed8\u51e6\u7406\u306e\u6319\u52d5\u304c\u7570\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DateCompatibilityHandler {\n    \/**\n     * \u30d0\u30fc\u30b8\u30e7\u30f3\u4e92\u63db\u6027\u3092\u8003\u616e\u3057\u305f\u65e5\u4ed8\u51e6\u7406\n     * @param string $date_string \u65e5\u4ed8\u6587\u5b57\u5217\n     * @return DateTime|false\n     *\/\n    public static function createDateTime($date_string) {\n        try {\n            if (version_compare(PHP_VERSION, '7.3.0', '&gt;=')) {\n                \/\/ PHP 7.3\u4ee5\u964d\u3067\u306f\u65b0\u3057\u3044\u6a5f\u80fd\u3092\u4f7f\u7528\n                return new DateTime($date_string, new DateTimeZone('UTC'));\n            } else {\n                \/\/ \u53e4\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306e\u4e92\u63db\u6027\u5bfe\u5fdc\n                $timestamp = strtotime($date_string);\n                if ($timestamp === false) {\n                    return false;\n                }\n                $dt = new DateTime();\n                $dt-&gt;setTimestamp($timestamp);\n                return $dt;\n            }\n        } catch (Exception $e) {\n            error_log(\"DateTime creation error: \" . $e-&gt;getMessage());\n            return false;\n        }\n    }\n    \n    \/**\n     * \u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u3068\u306e\u4e92\u63db\u6027\u3092\u4fdd\u3064\u305f\u3081\u306e\u5909\u63db\n     * @param mixed $date \u5909\u63db\u3059\u308b\u65e5\u4ed8\n     * @return string\n     *\/\n    public static function ensureCompatibleFormat($date) {\n        if ($date instanceof DateTime) {\n            return $date-&gt;format('Y-m-d H:i:s');\n        } elseif (is_numeric($date)) {\n            return date('Y-m-d H:i:s', $date);\n        } else {\n            $dt = self::createDateTime($date);\n            return $dt ? $dt-&gt;format('Y-m-d H:i:s') : 'Invalid Date';\n        }\n    }\n}\n\n\/\/ \u30d0\u30fc\u30b8\u30e7\u30f3\u4e92\u63db\u6027\u306e\u30c6\u30b9\u30c8\n$test_dates = [\n    '2024-03-05 15:00:00',\n    time(),\n    new DateTime(),\n    '2024\u5e743\u67085\u65e5'  \/\/ \u65e5\u672c\u8a9e\u5f62\u5f0f\n];\n\nforeach ($test_dates as $date) {\n    $result = DateCompatibilityHandler::ensureCompatibleFormat($date);\n    echo \"\u5909\u63db\u7d50\u679c: {$result}\\n\";\n}\n<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u624b\u6cd5\u306f\u3001\u5b9f\u969b\u306e\u958b\u767a\u73fe\u5834\u3067\u906d\u9047\u3059\u308b\u591a\u304f\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u7279\u306b\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u554f\u984c\u3084\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u306b\u5c55\u958b\u3055\u308c\u308b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u91cd\u8981\u306a\u8003\u616e\u70b9\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-12\">date\u95a2\u6570\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u4ee3\u66ff\u624b\u6bb5<\/h2>\n\n\n\n<p>PHP\u3067\u65e5\u4ed8\u51e6\u7406\u3092\u884c\u3046\u969b\u306e\u63a8\u5968\u3055\u308c\u308b\u5b9f\u88c5\u65b9\u6cd5\u3068\u3001\u3088\u308a\u5f37\u529b\u306a\u4ee3\u66ff\u624b\u6bb5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">DateTime\u30af\u30e9\u30b9\u3068\u306e\u5229\u7528<\/h3>\n\n\n\n<p>modern PHP\u3067\u306f\u3001DateTime\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u67d4\u8edf\u3067\u5805\u7262\u306a\u65e5\u4ed8\u51e6\u7406\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DateTimeHelper {\n    private DateTime $dateTime;\n    \n    public function __construct($dateString = 'now') {\n        try {\n            $this-&gt;dateTime = new DateTime($dateString);\n        } catch (Exception $e) {\n            throw new RuntimeException('Invalid date format: ' . $e-&gt;getMessage());\n        }\n    }\n    \n    \/**\n     * \u65e5\u4ed8\u306e\u52a0\u7b97\n     * @param string $interval \u671f\u9593\uff08\u4f8b\uff1a'1 day', '2 weeks', '3 months'\uff09\n     * @return self\n     *\/\n    public function add($interval): self {\n        $this-&gt;dateTime-&gt;modify(\"+{$interval}\");\n        return $this;\n    }\n    \n    \/**\n     * \u65e5\u4ed8\u306e\u6e1b\u7b97\n     * @param string $interval \u671f\u9593\n     * @return self\n     *\/\n    public function subtract($interval): self {\n        $this-&gt;dateTime-&gt;modify(\"-{$interval}\");\n        return $this;\n    }\n    \n    \/**\n     * \u65e5\u4ed8\u306e\u6bd4\u8f03\n     * @param DateTimeHelper $other \u6bd4\u8f03\u5bfe\u8c61\n     * @return int\n     *\/\n    public function compareTo(DateTimeHelper $other): int {\n        return $this-&gt;dateTime &lt;=&gt; $other-&gt;dateTime;\n    }\n    \n    \/**\n     * \u6307\u5b9a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u306e\u6587\u5b57\u5217\u5316\n     * @param string $format\n     * @return string\n     *\/\n    public function format($format = 'Y-m-d H:i:s'): string {\n        return $this-&gt;dateTime-&gt;format($format);\n    }\n    \n    \/**\n     * \u671f\u9593\u306e\u8a08\u7b97\n     * @param DateTimeHelper $other\n     * @return DateInterval\n     *\/\n    public function getDifference(DateTimeHelper $other): DateInterval {\n        return $this-&gt;dateTime-&gt;diff($other-&gt;dateTime);\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\n$helper = new DateTimeHelper('2024-03-05');\necho $helper-&gt;add('1 week')-&gt;format('Y-m-d'); \/\/ 2024-03-12\n\n\/\/ \u671f\u9593\u8a08\u7b97\n$start = new DateTimeHelper('2024-01-01');\n$end = new DateTimeHelper('2024-03-05');\n$interval = $start-&gt;getDifference($end);\necho \"\u671f\u9593: {$interval-&gt;days}\u65e5\";\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u65e5\u4ed8\u51e6\u7406\u306f\u983b\u7e41\u306b\u884c\u308f\u308c\u308b\u64cd\u4f5c\u306e\u305f\u3081\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u304c\u91cd\u8981\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DatePerformanceOptimizer {\n    private static array $cache = [];\n    \n    \/**\n     * \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6d3b\u7528\u3057\u305f\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\n     * @param string $date\n     * @param string $format\n     * @return string\n     *\/\n    public static function formatWithCache($date, $format = 'Y-m-d'): string {\n        $cacheKey = $date . $format;\n        \n        if (isset(self::$cache[$cacheKey])) {\n            return self::$cache[$cacheKey];\n        }\n        \n        $formatted = (new DateTime($date))-&gt;format($format);\n        self::$cache[$cacheKey] = $formatted;\n        \n        return $formatted;\n    }\n    \n    \/**\n     * \u30d0\u30c3\u30c1\u51e6\u7406\u7528\u306e\u6700\u9069\u5316\u3055\u308c\u305f\u65e5\u4ed8\u51e6\u7406\n     * @param array $dates\n     * @param string $format\n     * @return array\n     *\/\n    public static function batchProcess(array $dates, $format = 'Y-m-d'): array {\n        $results = [];\n        $dt = new DateTime();\n        \n        foreach ($dates as $date) {\n            $dt-&gt;modify($date);\n            $results[] = $dt-&gt;format($format);\n        }\n        \n        return $results;\n    }\n    \n    \/**\n     * \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30e1\u30c8\u30ea\u30af\u30b9\u306e\u53d6\u5f97\n     * @param callable $dateOperation\n     * @return array\n     *\/\n    public static function measurePerformance(callable $dateOperation): array {\n        $start = microtime(true);\n        $memoryStart = memory_get_usage();\n        \n        $result = $dateOperation();\n        \n        return [\n            'execution_time' =&gt; microtime(true) - $start,\n            'memory_usage' =&gt; memory_get_usage() - $memoryStart,\n            'result' =&gt; $result\n        ];\n    }\n}\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3068\u5165\u529b\u5024\u306e\u691c\u8a3c<\/h3>\n\n\n\n<p>\u65e5\u4ed8\u51e6\u7406\u306b\u304a\u3051\u308b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u305f\u3081\u306e\u5b9f\u88c5\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class SecureDateHandler {\n    \/**\n     * \u5b89\u5168\u306a\u65e5\u4ed8\u30d1\u30fc\u30b9\u51e6\u7406\n     * @param mixed $input\n     * @return DateTime|false\n     *\/\n    public static function parseSecurely($input) {\n        \/\/ SQL\u30a4\u30f3\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u5bfe\u7b56\n        if (!is_string($input) || preg_match('\/[\\'\";]\/', $input)) {\n            return false;\n        }\n        \n        try {\n            \/\/ \u53b3\u5bc6\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u30c1\u30a7\u30c3\u30af\n            $date = DateTime::createFromFormat('Y-m-d', $input);\n            if ($date &amp;&amp; $date-&gt;format('Y-m-d') === $input) {\n                return $date;\n            }\n            return false;\n        } catch (Exception $e) {\n            error_log(\"Date parsing error: \" . $e-&gt;getMessage());\n            return false;\n        }\n    }\n    \n    \/**\n     * \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u4fdd\u5b58\u7528\u306e\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\n     * @param DateTime $date\n     * @return string\n     *\/\n    public static function formatForDatabase(DateTime $date): string {\n        return $date-&gt;format('Y-m-d H:i:s');\n    }\n    \n    \/**\n     * \u8868\u793a\u7528\u306e\u5b89\u5168\u306aHTML\u51fa\u529b\n     * @param DateTime $date\n     * @param string $format\n     * @return string\n     *\/\n    public static function formatForDisplay(DateTime $date, $format = 'Y-m-d'): string {\n        return htmlspecialchars($date-&gt;format($format), ENT_QUOTES, 'UTF-8');\n    }\n    \n    \/**\n     * \u65e5\u4ed8\u7bc4\u56f2\u306e\u59a5\u5f53\u6027\u691c\u8a3c\n     * @param DateTime $start\n     * @param DateTime $end\n     * @param array $constraints\n     * @return bool\n     *\/\n    public static function validateDateRange(\n        DateTime $start,\n        DateTime $end,\n        array $constraints = []\n    ): bool {\n        \/\/ \u958b\u59cb\u65e5\u304c\u7d42\u4e86\u65e5\u3088\u308a\u524d\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\n        if ($start &gt;= $end) {\n            return false;\n        }\n        \n        \/\/ \u6700\u5927\u671f\u9593\u306e\u5236\u9650\n        if (isset($constraints['max_interval'])) {\n            $interval = $start-&gt;diff($end);\n            if ($interval-&gt;days &gt; $constraints['max_interval']) {\n                return false;\n            }\n        }\n        \n        \/\/ \u904e\u53bb\u306e\u65e5\u4ed8\u3092\u7981\u6b62\n        if (isset($constraints['no_past']) &amp;&amp; $constraints['no_past']) {\n            $now = new DateTime();\n            if ($start &lt; $now) {\n                return false;\n            }\n        }\n        \n        return true;\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\n$input = '2024-03-05';\nif ($date = SecureDateHandler::parseSecurely($input)) {\n    \/\/ \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u4fdd\u5b58\u7528\n    $dbFormat = SecureDateHandler::formatForDatabase($date);\n    \n    \/\/ \u8868\u793a\u7528\n    $displayFormat = SecureDateHandler::formatForDisplay($date, 'Y\u5e74m\u6708d\u65e5');\n    \n    \/\/ \u65e5\u4ed8\u7bc4\u56f2\u306e\u691c\u8a3c\n    $start = new DateTime('2024-03-05');\n    $end = new DateTime('2024-03-12');\n    $isValid = SecureDateHandler::validateDateRange($start, $end, [\n        'max_interval' =&gt; 30,\n        'no_past' =&gt; true\n    ]);\n}\n<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5168\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u65e5\u4ed8\u51e6\u7406\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002\u7279\u306bDateTime\u30af\u30e9\u30b9\u306e\u6d3b\u7528\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u306f\u3001\u30e2\u30c0\u30f3\u306aPHP\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u5fc5\u9808\u306e\u8981\u7d20\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-16\">\u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u30b5\u30f3\u30d7\u30eb\u3068\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/h2>\n\n\n\n<p>\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u6d3b\u7528\u3067\u304d\u308b\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u4f8b\u3092\u30013\u3064\u306e\u4e3b\u8981\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u306b\u5206\u3051\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u4e88\u7d04\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u65e5\u4ed8\u51e6\u7406\u306e\u5b9f\u8df5\u4f8b<\/h3>\n\n\n\n<p>\u4e88\u7d04\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u65e5\u4ed8\u3068\u6642\u9593\u306e\u51e6\u7406\u304c\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u5b9f\u88c5\u4f8b\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ReservationDateManager {\n    private $businessHours;\n    private $holidays;\n    \n    public function __construct() {\n        \/\/ \u55b6\u696d\u6642\u9593\u306e\u8a2d\u5b9a\n        $this-&gt;businessHours = [\n            'start' =&gt; '10:00',\n            'end' =&gt; '20:00',\n            'interval' =&gt; 30 \/\/ \u4e88\u7d04\u9593\u9694\uff08\u5206\uff09\n        ];\n        \n        \/\/ \u4f11\u696d\u65e5\u306e\u8a2d\u5b9a\n        $this-&gt;holidays = [\n            '2024-12-31',\n            '2025-01-01',\n            \/\/ \u4ed6\u306e\u4f11\u696d\u65e5\n        ];\n    }\n    \n    \/**\n     * \u5229\u7528\u53ef\u80fd\u306a\u4e88\u7d04\u6642\u9593\u67a0\u3092\u53d6\u5f97\n     * @param string $date\n     * @return array\n     *\/\n    public function getAvailableTimeSlots($date): array {\n        try {\n            $targetDate = new DateTime($date);\n            \n            \/\/ \u4f11\u696d\u65e5\u30c1\u30a7\u30c3\u30af\n            if (in_array($targetDate-&gt;format('Y-m-d'), $this-&gt;holidays)) {\n                return [];\n            }\n            \n            \/\/ \u55b6\u696d\u6642\u9593\u5185\u306e\u6642\u9593\u67a0\u3092\u751f\u6210\n            $slots = [];\n            $start = new DateTime($date . ' ' . $this-&gt;businessHours['start']);\n            $end = new DateTime($date . ' ' . $this-&gt;businessHours['end']);\n            $interval = new DateInterval('PT' . $this-&gt;businessHours['interval'] . 'M');\n            \n            $current = clone $start;\n            while ($current &lt; $end) {\n                $slots[] = $current-&gt;format('H:i');\n                $current-&gt;add($interval);\n            }\n            \n            return $slots;\n        } catch (Exception $e) {\n            error_log(\"Error generating time slots: \" . $e-&gt;getMessage());\n            return [];\n        }\n    }\n    \n    \/**\n     * \u4e88\u7d04\u306e\u91cd\u8907\u30c1\u30a7\u30c3\u30af\n     * @param string $startTime\n     * @param string $endTime\n     * @return bool\n     *\/\n    public function isTimeSlotAvailable($startTime, $endTime): bool {\n        \/\/ \u4e88\u7d04\u30c6\u30fc\u30d6\u30eb\u3068\u306e\u7167\u5408\u51e6\u7406\uff08\u7591\u4f3c\u30b3\u30fc\u30c9\uff09\n        $sql = \"SELECT COUNT(*) FROM reservations \n                WHERE (start_time &lt;= :end_time AND end_time &gt;= :start_time)\";\n        \/\/ \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7167\u4f1a\u51e6\u7406\n        return true; \/\/ \u5b9f\u969b\u306fDB\u7d50\u679c\u306b\u57fa\u3065\u3044\u3066\u8fd4\u3059\n    }\n    \n    \/**\n     * \u4e88\u7d04\u671f\u9650\u306e\u30c1\u30a7\u30c3\u30af\n     * @param string $reservationDate\n     * @return bool\n     *\/\n    public function isWithinReservationPeriod($reservationDate): bool {\n        $now = new DateTime();\n        $target = new DateTime($reservationDate);\n        $interval = $now-&gt;diff($target);\n        \n        \/\/ 3\u30f6\u6708\u5148\u307e\u3067\u306e\u4e88\u7d04\u3092\u53d7\u3051\u4ed8\u3051\u308b\n        return $interval-&gt;days &lt;= 90 &amp;&amp; $target &gt; $now;\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\n$manager = new ReservationDateManager();\n$availableSlots = $manager-&gt;getAvailableTimeSlots('2024-03-05');\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30ed\u30b0\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30ed\u30b0\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u65e5\u4ed8\u306b\u3088\u308b\u30ed\u30b0\u306e\u5206\u6790\u3068\u7ba1\u7406\u304c\u91cd\u8981\u306a\u6a5f\u80fd\u3068\u306a\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class LogDateAnalyzer {\n    private $logDirectory;\n    \n    public function __construct($logDirectory) {\n        $this-&gt;logDirectory = $logDirectory;\n    }\n    \n    \/**\n     * \u65e5\u4ed8\u7bc4\u56f2\u3067\u306e\u30ed\u30b0\u89e3\u6790\n     * @param string $startDate\n     * @param string $endDate\n     * @return array\n     *\/\n    public function analyzeLogs($startDate, $endDate): array {\n        try {\n            $start = new DateTime($startDate);\n            $end = new DateTime($endDate);\n            $results = [];\n            \n            \/\/ \u65e5\u4ed8\u7bc4\u56f2\u3067\u30eb\u30fc\u30d7\n            $current = clone $start;\n            while ($current &lt;= $end) {\n                $logFile = $this-&gt;logDirectory . '\/' . $current-&gt;format('Y-m-d') . '.log';\n                if (file_exists($logFile)) {\n                    $results[$current-&gt;format('Y-m-d')] = $this-&gt;processLogFile($logFile);\n                }\n                $current-&gt;modify('+1 day');\n            }\n            \n            return $results;\n        } catch (Exception $e) {\n            error_log(\"Log analysis error: \" . $e-&gt;getMessage());\n            return [];\n        }\n    }\n    \n    \/**\n     * \u30ed\u30b0\u306e\u81ea\u52d5\u30a2\u30fc\u30ab\u30a4\u30d6\u51e6\u7406\n     * @param int $daysToKeep\n     * @return bool\n     *\/\n    public function archiveOldLogs($daysToKeep = 30): bool {\n        try {\n            $cutoffDate = new DateTime();\n            $cutoffDate-&gt;modify(\"-{$daysToKeep} days\");\n            \n            $iterator = new DirectoryIterator($this-&gt;logDirectory);\n            foreach ($iterator as $fileInfo) {\n                if ($fileInfo-&gt;isFile() &amp;&amp; $fileInfo-&gt;getExtension() === 'log') {\n                    $logDate = DateTime::createFromFormat(\n                        'Y-m-d',\n                        pathinfo($fileInfo-&gt;getFilename(), PATHINFO_FILENAME)\n                    );\n                    \n                    if ($logDate &amp;&amp; $logDate &lt; $cutoffDate) {\n                        \/\/ \u30a2\u30fc\u30ab\u30a4\u30d6\u51e6\u7406\n                        $archivePath = $this-&gt;logDirectory . '\/archive\/' . \n                                     $logDate-&gt;format('Y\/m');\n                        if (!is_dir($archivePath)) {\n                            mkdir($archivePath, 0755, true);\n                        }\n                        rename($fileInfo-&gt;getPathname(), \n                               $archivePath . '\/' . $fileInfo-&gt;getFilename());\n                    }\n                }\n            }\n            return true;\n        } catch (Exception $e) {\n            error_log(\"Archive process error: \" . $e-&gt;getMessage());\n            return false;\n        }\n    }\n}\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3068\u306e\u9023\u643a\u306b\u304a\u3051\u308b\u65e5\u4ed8\u51e6\u7406<\/h3>\n\n\n\n<p>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3068\u306e\u9023\u643a\u3067\u5fc5\u8981\u3068\u306a\u308b\u65e5\u4ed8\u51e6\u7406\u306e\u5b9f\u88c5\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DatabaseDateHandler {\n    private $pdo;\n    \n    public function __construct(PDO $pdo) {\n        $this-&gt;pdo = $pdo;\n    }\n    \n    \/**\n     * \u65e5\u4ed8\u7bc4\u56f2\u3067\u306e\u691c\u7d22\n     * @param string $table\n     * @param string $dateColumn\n     * @param string $startDate\n     * @param string $endDate\n     * @return array\n     *\/\n    public function findRecordsByDateRange(\n        string $table,\n        string $dateColumn,\n        string $startDate,\n        string $endDate\n    ): array {\n        try {\n            $sql = \"SELECT * FROM {$table} \n                    WHERE {$dateColumn} BETWEEN :start AND :end\n                    ORDER BY {$dateColumn}\";\n            \n            $stmt = $this-&gt;pdo-&gt;prepare($sql);\n            $stmt-&gt;execute([\n                ':start' =&gt; $startDate,\n                ':end' =&gt; $endDate\n            ]);\n            \n            return $stmt-&gt;fetchAll(PDO::FETCH_ASSOC);\n        } catch (PDOException $e) {\n            error_log(\"Database query error: \" . $e-&gt;getMessage());\n            return [];\n        }\n    }\n    \n    \/**\n     * \u65e5\u4ed8\u30c7\u30fc\u30bf\u306e\u4e00\u62ec\u66f4\u65b0\n     * @param string $table\n     * @param array $records\n     * @return bool\n     *\/\n    public function batchUpdateDates(string $table, array $records): bool {\n        try {\n            $this-&gt;pdo-&gt;beginTransaction();\n            \n            $sql = \"UPDATE {$table} SET \n                    updated_at = :updated_at,\n                    expiry_date = :expiry_date\n                    WHERE id = :id\";\n            \n            $stmt = $this-&gt;pdo-&gt;prepare($sql);\n            \n            foreach ($records as $record) {\n                $stmt-&gt;execute([\n                    ':updated_at' =&gt; date('Y-m-d H:i:s'),\n                    ':expiry_date' =&gt; (new DateTime())\n                        -&gt;modify('+30 days')\n                        -&gt;format('Y-m-d H:i:s'),\n                    ':id' =&gt; $record['id']\n                ]);\n            }\n            \n            $this-&gt;pdo-&gt;commit();\n            return true;\n        } catch (Exception $e) {\n            $this-&gt;pdo-&gt;rollBack();\n            error_log(\"Batch update error: \" . $e-&gt;getMessage());\n            return false;\n        }\n    }\n    \n    \/**\n     * \u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u5909\u63db\uff08\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u8003\u616e\uff09\n     * @param string $date\n     * @param string $fromTimezone\n     * @param string $toTimezone\n     * @return string\n     *\/\n    public function convertDateTimeZone(\n        string $date,\n        string $fromTimezone = 'UTC',\n        string $toTimezone = 'Asia\/Tokyo'\n    ): string {\n        try {\n            $dt = new DateTime($date, new DateTimeZone($fromTimezone));\n            $dt-&gt;setTimezone(new DateTimeZone($toTimezone));\n            return $dt-&gt;format('Y-m-d H:i:s');\n        } catch (Exception $e) {\n            error_log(\"Timezone conversion error: \" . $e-&gt;getMessage());\n            return $date;\n        }\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\n$dbHandler = new DatabaseDateHandler($pdo);\n\n\/\/ \u65e5\u4ed8\u7bc4\u56f2\u3067\u306e\u691c\u7d22\n$records = $dbHandler-&gt;findRecordsByDateRange(\n    'orders',\n    'order_date',\n    '2024-03-01',\n    '2024-03-31'\n);\n\n\/\/ \u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u5909\u63db\n$localTime = $dbHandler-&gt;convertDateTimeZone(\n    '2024-03-05 10:00:00',\n    'UTC',\n    'Asia\/Tokyo'\n);\n<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u88c5\u4f8b\u306f\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3050\u306b\u6d3b\u7528\u3067\u304d\u308b\u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u3067\u3059\u3002\u4e88\u7d04\u30b7\u30b9\u30c6\u30e0\u3001\u30ed\u30b0\u7ba1\u7406\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u9023\u643a\u3068\u3044\u3063\u305f\u4e00\u822c\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u306b\u304a\u3044\u3066\u3001\u65e5\u4ed8\u51e6\u7406\u3092\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u30b3\u30fc\u30c9\u306f\u3001\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u8003\u616e\u3057\u3066\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,63],"tags":[],"class_list":{"0":"post-3395","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-php","7":"category-php-syntax","8":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/3395","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3395"}],"version-history":[{"count":2,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/3395\/revisions"}],"predecessor-version":[{"id":3397,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/3395\/revisions\/3397"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}