{"id":10259,"date":"2026-04-16T00:25:30","date_gmt":"2026-04-15T15:25:30","guid":{"rendered":"https:\/\/randyapps.com\/?post_type=blog&p=10259"},"modified":"2026-04-16T00:25:30","modified_gmt":"2026-04-15T15:25:30","slug":"10259","status":"publish","type":"blog","link":"https:\/\/randyapps.com\/ja\/blog\/10259","title":{"rendered":"\u3010JavaScript\u3011\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u8a08\u7b97 #3\uff1adate-fns\u3068@date-fns\/tz\u3092\u7528\u3044\u305f\u5b89\u5168\u306a\u5b9f\u88c5"},"content":{"rendered":"

<\/p>\n

\u51683\u56de\u306b\u308f\u305f\u3063\u3066\u304a\u5c4a\u3051\u3057\u3066\u3044\u308bJS\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u8a08\u7b97\u30b7\u30ea\u30fc\u30ba\u306e\u6700\u7d42\u56de\u3067\u3059\u3002<\/p>\n

\u7b2c1\u56de\u3001\u7b2c2\u56de\u306e\u8a18\u4e8b\u3067\u306f\u3001JavaScript\u306e\u6a19\u6e96\u6a5f\u80fd\uff08Date<\/code> \u3068 Intl<\/code>\uff09\u306e\u307f\u3092\u7528\u3044\u3066\u7279\u5b9a\u90fd\u5e02\u306e\u6642\u523b\u304b\u3089UTC\uff08\u5354\u5b9a\u4e16\u754c\u6642\uff09\u3092\u9006\u7b97\u3059\u308b\u624b\u6cd5\u3068\u3001\u305d\u3053\u306b\u6f5c\u3080\u300c\u5b9f\u884c\u74b0\u5883\u306e\u6642\u5dee\u306b\u4f9d\u5b58\u3057\u3066\u3057\u307e\u3046\u554f\u984c\uff08\u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u306e\u7f60\uff09\u300d\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u88dc\u8db3\u3057\u3066\u304a\u304f\u3068\u3001\u7d76\u5bfe\u7684\u306a\u57fa\u6e96\u3067\u3042\u308b\u300c\u6b63\u78ba\u306aUTC\u6642\u523b\u300d\u3055\u3048\u624b\u5143\u306b\u3042\u308c\u3070\u3001\u305d\u308c\u3092\u300c\u7279\u5b9a\u90fd\u5e02\u306e\u30ed\u30fc\u30ab\u30eb\u6642\u523b\u300d\u306b\u5909\u63db\u3057\u3066\u753b\u9762\u306b\u8868\u793a\u3059\u308b\u51e6\u7406\u81ea\u4f53\u306f\u3001\u6a19\u6e96\u6a5f\u80fd\u306e Intl<\/code> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u5341\u5206\u6b63\u78ba\u306b\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\n\u3057\u304b\u3057\u3001\u305d\u306e\u9006\u3067\u3042\u308b\u300c\u7279\u5b9a\u90fd\u5e02\u306e\u30ed\u30fc\u30ab\u30eb\u6642\u523b\u6587\u5b57\u5217\u300d\u304b\u3089\u300cUTC\u300d\u3092\u9006\u7b97\u3057\u3066\u4f5c\u308a\u51fa\u305d\u3046\u3068\u3057\u305f\u9014\u7aef\u306b\u3001\u6a19\u6e96\u6a5f\u80fd\u3067\u306f\u5b9f\u884c\u74b0\u5883\u306e\u6642\u5dee\u3068\u3044\u3046\u58c1\u306b\u963b\u307e\u308c\u3066\u3057\u307e\u3046<\/strong>\u306e\u3067\u3059\u3002<\/p>\n

\u81ea\u529b\u3067\u3053\u306e\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u3092\u3059\u3079\u3066\u7db2\u7f85\u3059\u308b\u30ed\u30b8\u30c3\u30af\u3092\u7d44\u3080\u306e\u306f\u73fe\u5b9f\u7684\u3067\u306f\u306a\u3044\u3068\u3044\u3046\u306e\u304c\u79c1\u500b\u4eba\u306e\u7d50\u8ad6\u3067\u3059\u3002\u305d\u3053\u3067\u4eca\u56de\u306f\u3001\u3053\u306e\u300c\u30ed\u30fc\u30ab\u30eb\u6642\u523b\u304b\u3089UTC\u3078\u306e\u5909\u63db\u300d\u3068\u3044\u3046\u96e3\u6240\u306e\u307f\u3092\u5b89\u5168\u306b\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u79c1\u304c\u5c0e\u5165\u3057\u305f\u3001\u5b9a\u756a\u306e\u516c\u5f0f\u30e9\u30a4\u30d6\u30e9\u30ea\u300c@date-fns\/tz\u300d<\/strong>\u3092\u4f7f\u3063\u305f\u5b9f\u88c5\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n

@date-fns\/tz \u3068\u306f\uff1f<\/h2>\n

@date-fns\/tz<\/code> \u306f\u3001JavaScript\u3067\u5b9a\u756a\u306e\u65e5\u4ed8\u64cd\u4f5c\u30e9\u30a4\u30d6\u30e9\u30ea date-fns<\/code> \u3092\u62e1\u5f35\u3059\u308b\u305f\u3081\u306e\u516c\u5f0f\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u3059\u3002\u30d6\u30e9\u30a6\u30b6\u306b\u5185\u8535\u3055\u308c\u3066\u3044\u308bIANA\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\uff08\u4e16\u754c\u4e2d\u306e\u6642\u5dee\u3084\u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u306e\u30eb\u30fc\u30eb\u304c\u8a18\u9332\u3055\u308c\u305f\u6a19\u6e96\u8f9e\u66f8\uff09\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u4ed5\u7d44\u307f\u3092\u5229\u7528\u3057\u3066\u304a\u308a\u3001\u74b0\u5883\u306b\u4f9d\u5b58\u3057\u306a\u3044\u6b63\u78ba\u306a\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u8a08\u7b97\u3092\u63d0\u4f9b\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n

\u4eca\u56de\u306fWeb\u30a2\u30d7\u30ea\u3084\u30d6\u30e9\u30a6\u30b6\u4e0a\u3067\u624b\u8efd\u306b\u691c\u8a3c\u3067\u304d\u308b\u3088\u3046\u3001type=\"module\"<\/code> \u3092\u6307\u5b9a\u3057\u3066CDN\uff08jsDelivr\u306e +esm<\/code> \u6a5f\u80fd\uff09\u7d4c\u7531\u3067\u8aad\u307f\u8fbc\u3080\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u63a1\u7528\u3057\u307e\u3059\u3002\u30d3\u30eb\u30c9\u74b0\u5883\u304c\u306a\u304f\u3066\u3082\u4f9d\u5b58\u95a2\u4fc2\u3092\u81ea\u52d5\u3067\u89e3\u6c7a\u3057\u3066\u304f\u308c\u308b\u305f\u3081\u3001\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n

\n \u3010HTML\/JS\u3067\u306e\u8aad\u307f\u8fbc\u307f\u4f8b\u3011<\/strong><\/p>\n
<script type=\"module\">\r\n  \/\/ date-fns\u672c\u4f53\u306e\u30d1\u30fc\u30b9\u6a5f\u80fd\u3068\u3001@date-fns\/tz\u306e\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u6a5f\u80fd\u3092\u8aad\u307f\u8fbc\u3080\r\n  import { parseISO } from 'https:\/\/cdn.jsdelivr.net\/npm\/date-fns@4.1.0\/+esm';\r\n  import { tz } from 'https:\/\/cdn.jsdelivr.net\/npm\/@date-fns\/tz@1.4.1\/+esm';\r\n  \r\n  \/\/ \u4ee5\u964d\u306e\u51e6\u7406\u3092\u3053\u3053\u306b\u8a18\u8ff0\u3057\u307e\u3059\r\n<\/script>\r\n<\/code><\/pre>\n<\/div>\n
\u30b7\u30f3\u30d7\u30eb\u306a\u5b9f\u88c5\u30b3\u30fc\u30c9<\/h2>\n
\u79c1\u304c\u5b9f\u73fe\u3057\u305f\u304b\u3063\u305f\u300c\u6307\u5b9a\u3057\u305f\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u30ed\u30fc\u30ab\u30eb\u6642\u523b\u6587\u5b57\u5217\u304b\u3089\u3001\u6b63\u78ba\u306aUTC\u3092\u9006\u7b97\u3059\u308b\u300d<\/strong>\u3068\u3044\u3046\u51e6\u7406\u306f\u3001\u3053\u308c\u3089\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u975e\u5e38\u306b\u30b7\u30f3\u30d7\u30eb\u306b\u8a18\u8ff0\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u6069\u6075\u3092\u5b9f\u611f\u3057\u3066\u3044\u305f\u3060\u304f\u305f\u3081\u306b\u3001\u7b2c1\u56de\u3067\u66f8\u3044\u305f\u300c\u6a19\u6e96\u6a5f\u80fd\u3060\u3051\u3092\u4f7f\u3063\u305f\u30b3\u30fc\u30c9\u300d\u3068\u3001\u4eca\u56de\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3063\u305f\u30b3\u30fc\u30c9\u3092\u898b\u6bd4\u3079\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\n    \u3010Before\uff1a\u6a19\u6e96\u6a5f\u80fd\u3060\u3051\u3092\u4f7f\u3063\u305f\u5834\u5408\uff08\u7b2c1\u56de\u306e\u30b3\u30fc\u30c9\uff09\u3011<\/strong><\/p>\n
const targetTimeStr = '2026-01-10T07:00:00';\r\nconst targetTimeZone = 'America\/New_York';\r\n\r\n\/\/ 1. \u30d5\u30a9\u30fc\u30de\u30c3\u30bf\u30fc\u306e\u6e96\u5099\r\nconst formatter = new Intl.DateTimeFormat('en-US', { timeZone: targetTimeZone, timeZoneName: 'longOffset' });\r\n\/\/ 2. \u5b9f\u884c\u74b0\u5883\u306e\u6642\u5dee\u306b\u5f71\u97ff\u3055\u308c\u308b\u300c\u4eee\u306eDate\u300d\u3092\u4f5c\u6210\r\nconst tempDate = new Date(targetTimeStr);\r\n\/\/ 3. \u914d\u5217\u306b\u5206\u89e3\u3057\u3066\u6642\u5dee\u30d1\u30fc\u30c4\u3092\u62bd\u51fa\r\nconst offsetPart = formatter.formatToParts(tempDate).find(p => p.type === 'timeZoneName').value;\r\n\/\/ 4. \u6587\u5b57\u5217\u306e\u6574\u5f62\uff08GMT\u3092\u6d88\u3059\u306a\u3069\uff09\r\nconst offsetString = offsetPart.replace('GMT', '') || 'Z';\r\n\/\/ 5. \u5143\u306e\u6587\u5b57\u5217\u306b\u6642\u5dee\u3092\u7d50\u5408\u3057\u3066\u518d\u751f\u6210\r\nconst finalUtcDate = new Date(`${targetTimeStr}${offsetString}`);\r\n<\/code><\/pre>\n<\/div>\n
\n    \u3010After\uff1a@date-fns\/tz \u3092\u4f7f\u3063\u305f\u5834\u5408\u3011<\/strong><\/p>\n
import { parseISO } from 'https:\/\/cdn.jsdelivr.net\/npm\/date-fns@4.1.0\/+esm';\r\nimport { tz } from 'https:\/\/cdn.jsdelivr.net\/npm\/@date-fns\/tz@1.4.1\/+esm';\r\n\r\nconst targetTimeStr = '2026-01-10T07:00:00';\r\nconst targetTimeZone = 'America\/New_York';\r\n\r\n\/\/ \u6307\u5b9a\u3057\u305f\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8(in: tz)\u3092\u6301\u305f\u305b\u3066\u3001\u6642\u523b\u6587\u5b57\u5217\u3092\u76f4\u63a5\u30d1\u30fc\u30b9\u3059\u308b\r\nconst tzDate = parseISO(targetTimeStr, { in: tz(targetTimeZone) });\r\n\r\n\/\/ \u6700\u5f8c\u306b\u6a19\u6e96\u306eDate\u306b\u623b\u3059\u3053\u3068\u3067\u3001\u3069\u306e\u74b0\u5883\u3067\u3082\u5fc5\u305a\u672b\u5c3e\u304cZ\u306eUTC\u65e5\u6642\u304c\u53d6\u5f97\u3067\u304d\u308b\r\nconst finalUtcDate = new Date(tzDate.getTime());\r\n\r\nconsole.log('UTC\u65e5\u6642:', finalUtcDate.toISOString());\r\n\/\/ \u51fa\u529b: 2026-01-10T12:00:00.000Z\r\n<\/code><\/pre>\n<\/div>\n
\u4f55\u304c\u3069\u3046\u7c21\u5358\u306b\u306a\u3063\u305f\u306e\u304b\uff1f<\/h3>\n
\u898b\u6bd4\u3079\u3066\u3044\u305f\u3060\u3051\u308c\u3070\u4e00\u76ee\u77ad\u7136\u3067\u3059\u304c\u3001\u3042\u3093\u306a\u306b\u9577\u304b\u3063\u305f\u51e6\u7406\u304c\u5b9f\u8cea1\u884c\uff08parseISO<\/code>\uff09<\/strong>\u306b\u7f6e\u304d\u63db\u308f\u3063\u3066\u3044\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u3069\u306e\u82e6\u52b4\u304c\u306a\u304f\u306a\u3063\u305f\u306e\u304b\u3001\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n
    \n
  1. \u300c\u4eee\u306eDate\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u304c\u4e0d\u8981\u306b\u306a\u3063\u305f<\/strong>
    \n    \u6a19\u6e96\u6a5f\u80fd\u3067\u306f\u3001Intl<\/code> \u306b\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u8a08\u7b97\u3055\u305b\u308b\u305f\u3081\u306e\u300c\u7a2e\u300d\u3068\u3057\u3066\u3001\u5b9f\u884c\u74b0\u5883\uff08\u30d6\u30e9\u30a6\u30b6\uff09\u306e\u6642\u5dee\u306b\u5f71\u97ff\u3055\u308c\u305f tempDate<\/code> \u3092\u4e00\u5ea6\u4f5c\u3089\u3056\u308b\u3092\u5f97\u307e\u305b\u3093\u3067\u3057\u305f\uff08\u3053\u308c\u304c\u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u306e\u7f60\u3092\u5f15\u304d\u8d77\u3053\u3059\u5143\u51f6\u3067\u3057\u305f\uff09\u3002\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3048\u3070\u3001\u30d1\u30fc\u30b9\u306e\u6642\u70b9\u3067\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u3092\u6307\u5b9a\u3067\u304d\u308b\u305f\u3081\u3001\u5384\u4ecb\u306a\u624b\u9806\u304c\u6839\u672c\u304b\u3089\u4e0d\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u6700\u521d\u304b\u3089\u300c\u30cb\u30e5\u30fc\u30e8\u30fc\u30af\u306e7\u6642\u300d\u3068\u3057\u3066\u5b89\u5168\u306b\u8a08\u7b97\u3092\u30b9\u30bf\u30fc\u30c8\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/li>\n
  2. \u6587\u5b57\u5217\u306e\u5206\u89e3\u3068\u62bd\u51fa\u304c\u4e0d\u8981\u306b\u306a\u3063\u305f<\/strong>
    \n    formatToParts<\/code> \u3092\u4f7f\u3063\u3066\u914d\u5217\u306b\u5909\u63db\u3057\u3001\u305d\u3053\u304b\u3089 type === 'timeZoneName'<\/code> \u3092\u63a2\u3057\u51fa\u3059\u3068\u3044\u3046\u56de\u308a\u304f\u3069\u3044\u51e6\u7406\u304c\u4e38\u3054\u3068\u6d88\u3048\u307e\u3057\u305f\u3002<\/li>\n
  3. “GMT” \u3092\u524a\u308b\u624b\u52d5\u306e\u6587\u5b57\u5217\u64cd\u4f5c\u304c\u4e0d\u8981\u306b\u306a\u3063\u305f<\/strong>
    \n    \u53d6\u5f97\u3057\u305f “GMT-05:00” \u304b\u3089\u4f59\u8a08\u306a\u6587\u5b57\u3092 replace<\/code> \u3067\u524a\u308a\u53d6\u308a\u3001\u5143\u306e\u6642\u9593\u6587\u5b57\u5217\u306e\u672b\u5c3e\u306b\u7d50\u5408\u3057\u76f4\u3059\u3068\u3044\u3046\u3001\u30d0\u30b0\u306e\u6e29\u5e8a\u306b\u306a\u308a\u3084\u3059\u3044\u624b\u52d5\u306e\u6587\u5b57\u5217\u64cd\u4f5c\u304c\u4e00\u5207\u306a\u304f\u306a\u308a\u307e\u3057\u305f\u3002<\/li>\n<\/ol>\n
    \u79c1\u305f\u3061\u304c\u3084\u308b\u3079\u304d\u3053\u3068\u306f\u3001parseISO()<\/code> \u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u306b { in: tz('\u8abf\u3079\u305f\u3044\u30bf\u30a4\u30e0\u30be\u30fc\u30f3') }<\/code> \u3092\u6307\u5b9a\u3059\u308b\u3060\u3051\u3067\u3059\u3002\u3042\u3068\u306f\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u88cf\u5074\u3067\u3001\u30d6\u30e9\u30a6\u30b6\u5185\u8535\u306eIANA\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3068\u7167\u3089\u3057\u5408\u308f\u305b\u3001\u5b9f\u884c\u74b0\u5883\u306e\u6642\u5dee\u3092\u5b8c\u5168\u306b\u7121\u8996\u3057\u305f\u4e0a\u3067\u300c\u6b63\u78ba\u306a\u7d76\u5bfe\u6642\u9593\u300d\u3092\u81ea\u52d5\u3067\u7b97\u51fa\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n
    \u3010\u304a\u307e\u3051\u3011\u5e74\u6708\u65e5\u3084\u6642\u9593\u3092\u300c\u6570\u5024\u300d\u3067\u6301\u3063\u3066\u3044\u308b\u5834\u5408<\/h3>\n
    \u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4ed5\u69d8\u306b\u3088\u3063\u3066\u306f\u3001\u6642\u523b\u304c\u6587\u5b57\u5217\uff08'2026-01-10T07:00:00'<\/code>\uff09\u3067\u306f\u306a\u304f\u3001\u5e74\u6708\u65e5\u3084\u6642\u9593\u304c\u500b\u5225\u306e\u5909\u6570\uff08\u6570\u5024\uff09\u3068\u3057\u3066\u5206\u304b\u308c\u3066\u3044\u308b\u30b1\u30fc\u30b9\u3082\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
    \u6a19\u6e96\u306e Date<\/code> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3082 new Date(2026, 0, 10, 7, 0)<\/code> \u306e\u3088\u3046\u306b\u6570\u5024\u304b\u3089\u751f\u6210\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u304c\u3001\u3053\u308c\u306b\u306f\u300c\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u3092\u6307\u5b9a\u3059\u308b\u5f15\u6570\u300d\u304c\u5b58\u5728\u3057\u306a\u3044\u305f\u3081\u3001\u5f37\u5236\u7684\u306b\u5b9f\u884c\u74b0\u5883\uff08\u65e5\u672c\u6642\u9593\u306a\u3069\uff09\u3068\u3057\u3066\u5224\u5b9a\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n
    \u3057\u304b\u3057\u3001@date-fns\/tz<\/code> \u306e TZDate<\/code> \u30af\u30e9\u30b9<\/strong>\u3092\u4f7f\u3048\u3070\u3001\u5f15\u6570\u306e\u6700\u5f8c\u306b\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u540d\u3092\u76f4\u63a5\u6e21\u3059\u3053\u3068\u3067\u3001\u3053\u306e\u554f\u984c\u3092\u7f8e\u3057\u304f\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002<\/p>\n
    \n
    import { TZDate } from 'https:\/\/cdn.jsdelivr.net\/npm\/@date-fns\/tz@1.4.1\/+esm';\r\n\r\n\/\/ \u5e74\u6708\u65e5\u3084\u6642\u9593\u304c\u5225\u3005\u306e\u5909\u6570\uff08\u6570\u5024\uff09\u3067\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u5834\u5408\r\nconst y = 2026;\r\nconst m = 1; \/\/ 1\u6708\r\nconst d = 10;\r\nconst h = 7; \/\/ \u671d7\u6642\r\nconst min = 0; \/\/ 0\u5206\r\nconst targetTimeZone = 'America\/New_York';\r\n\r\n\/\/ \u5f15\u6570: \u5e74, \u6708(\u203b0\u59cb\u307e\u308a\u306e\u305f\u3081-1\u3059\u308b), \u65e5, \u6642, \u5206, \u79d2, \u30df\u30ea\u79d2, \u30bf\u30a4\u30e0\u30be\u30fc\u30f3\r\n\/\/ \u6587\u5b57\u5217\u30d1\u30fc\u30b9\u3092\u4ecb\u3055\u306a\u3044\u305f\u3081\u3001\u30ed\u30fc\u30ab\u30eb\u6642\u9593\u306e\u7f60\u306b\u306f\u307e\u3089\u305a\u5b89\u5168\u306b\u751f\u6210\u3067\u304d\u308b\r\nconst tzDate = new TZDate(y, m - 1, d, h, min, 0, 0, targetTimeZone);\r\n\r\nconst finalUtcDate = new Date(tzDate.getTime());\r\n\r\nconsole.log('UTC\u65e5\u6642:', finalUtcDate.toISOString());\r\n\/\/ \u51fa\u529b: 2026-01-10T12:00:00.000Z\r\n<\/code><\/pre>\n<\/div>\n
    \u203b\u6ce8\u610f\u70b9\u3068\u3057\u3066\u3001JavaScript\u6a19\u6e96\u306e Date<\/code> \u306e\u4ed5\u69d8\u306b\u306a\u3089\u3044\u3001\u6708\uff08month\uff09\u306e\u307f\u300c0\u59cb\u307e\u308a\uff081\u6708=0\u30012\u6708=1…\uff09\u300d<\/strong>\u306b\u306a\u308b\u70b9\u3060\u3051\u6c17\u3092\u3064\u3051\u3066\u304f\u3060\u3055\u3044\u3002\u6587\u5b57\u5217\u306e\u30d1\u30fc\u30b9\u51e6\u7406\u3092\u4ecb\u3055\u306a\u3044\u305f\u3081\u3001\u74b0\u5883\u4f9d\u5b58\u306e\u7f60\u3092\u5b8c\u5168\u306b\u56de\u907f\u3067\u304d\u308b\u975e\u5e38\u306b\u5805\u7262\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u3067\u3059\u3002<\/p>\n
    \u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u306e\u5207\u308a\u66ff\u3048\u65e5\u6642\u306e\u691c\u8a3c<\/h2>\n
    \u30b3\u30fc\u30c9\u304c\u7c21\u6f54\u306b\u306a\u308b\u3053\u3068\u3082\u5229\u70b9\u3067\u3059\u304c\u3001\u672c\u6765\u306e\u76ee\u7684\u306f\u300c\u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u306e\u5883\u754c\u7dda\u4ed8\u8fd1\u3067\u767a\u751f\u3059\u308b\u30ba\u30ec\u300d\u3092\u89e3\u6d88\u3067\u304d\u308b\u304b<\/strong>\u3069\u3046\u304b\u3067\u3059\u3002<\/p>\n
    \u7b2c2\u56de\u3067\u4e0d\u5177\u5408\u306e\u8981\u56e0\u3068\u306a\u3063\u305f\u3001\u300c\u30a2\u30c7\u30ec\u30fc\u30c9\uff08\u30aa\u30fc\u30b9\u30c8\u30e9\u30ea\u30a2\uff09\u300d\u3068\u300c\u30cb\u30e5\u30fc\u30e8\u30fc\u30af\u300d\u306e\u30c7\u30fc\u30bf\u3092\u7528\u3044\u3066\u3001\u52d5\u4f5c\u3092\u691c\u8a3c\u3057\u3066\u307f\u307e\u3059\u3002
    \n\u751f\u6210\u3055\u308c\u305f\u6b63\u78ba\u306a\u7d76\u5bfe\u6642\u9593\uff08UTC\uff09\u3055\u3048\u3042\u308c\u3070\u3001\u6a19\u6e96\u6a5f\u80fd\u3067\u3042\u308b toLocaleString<\/code> \u3092\u4f7f\u3063\u3066\u3069\u306e\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u6642\u523b\u3068\u3057\u3066\u3082\u6b63\u78ba\u306b\u51fa\u529b\u3067\u304d\u308b\u305f\u3081\u3001\u3053\u3053\u3067\u306f\u78ba\u8a8d\u7528\u306b\u6a19\u6e96\u6a5f\u80fd\u3092\u7528\u3044\u3066\u30ed\u30fc\u30ab\u30eb\u6642\u9593\u3078\u623b\u3057\u3066\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
    \u691c\u8a3c1\uff1a\u30a2\u30c7\u30ec\u30fc\u30c9\u306e\u5207\u308a\u66ff\u3048\u76f4\u524d\uff08\u590f\u6642\u9593\u524d\uff09<\/h3>\n
    \u30a2\u30c7\u30ec\u30fc\u30c9\u3067\u306f\u30012026\u5e7410\u67084\u65e5\u306e\u5348\u524d2:00\u306b\u590f\u6642\u9593\u304c\u958b\u59cb\u3055\u308c\u307e\u3059\u3002\u6a19\u6e96\u6a5f\u80fd\u3060\u3051\u3067\u9006\u7b97\u3057\u3088\u3046\u3068\u3057\u305f\u969b\u306f\u3001\u305d\u306e\u76f4\u524d\u306e\u300c1:30\u300d\u3092\u6307\u5b9a\u3057\u305f\u6642\u306b\u8aa4\u3063\u3066\u590f\u6642\u9593\u3068\u5224\u5b9a\u3055\u308c\u3001\u300c0:30\u300d\u3078\u3068\u30ba\u30ec\u3066\u3057\u307e\u3046\u73fe\u8c61\u304c\u8d77\u304d\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n
    import { parseISO } from 'https:\/\/cdn.jsdelivr.net\/npm\/date-fns@4.1.0\/+esm';\r\nimport { tz } from 'https:\/\/cdn.jsdelivr.net\/npm\/@date-fns\/tz@1.4.1\/+esm';\r\n\r\n\/\/ \u30a2\u30c7\u30ec\u30fc\u30c9\uff1a\u590f\u6642\u9593\u958b\u59cb\u306e30\u5206\u524d\r\nconst targetTimeStr = '2026-10-04T01:30:00'; \r\nconst targetTimeZone = 'Australia\/Adelaide';\r\n\r\n\/\/ \u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3063\u3066UTC\u3078\u9006\u7b97\r\nconst safeTzDate = parseISO(targetTimeStr, { in: tz(targetTimeZone) });\r\nconst safeDate = new Date(safeTzDate.getTime());\r\n\r\n\/\/ \u78ba\u8a8d\u306e\u305f\u3081\u3001\u6a19\u6e96\u6a5f\u80fd\u3067\u30ed\u30fc\u30ab\u30eb\u6642\u9593\u306b\u623b\u3057\u3066\u51fa\u529b\r\nconsole.log(safeDate.toLocaleString('ja-JP', { timeZone: targetTimeZone }));\r\n\/\/ \u51fa\u529b\u4f8b: 2026\/10\/4 1:30:00\r\n<\/code><\/pre>\n
    \u691c\u8a3c2\uff1a\u30cb\u30e5\u30fc\u30e8\u30fc\u30af\u306e\u5207\u308a\u66ff\u3048\u76f4\u5f8c\uff08\u590f\u6642\u9593\uff09<\/h3>\n
    \u30cb\u30e5\u30fc\u30e8\u30fc\u30af\u3067\u306f\u30012026\u5e743\u67088\u65e5\u306e\u5348\u524d2:00\u304c3:00\u3078\u3068\u9032\u307f\u3001\u590f\u6642\u9593\u304c\u59cb\u307e\u308a\u307e\u3059\u3002\u6a19\u6e96\u6a5f\u80fd\u3067\u306f\u300c5:00\u300d\u3092\u6307\u5b9a\u3057\u305f\u6642\u3001\u51ac\u6642\u9593\u3068\u8aa4\u8a8d\u3055\u308c\u3066\u300c6:00\u300d\u306b\u30ba\u30ec\u3066\u3057\u307e\u3046\u30b1\u30fc\u30b9\u3067\u3057\u305f\u3002<\/p>\n
    import { parseISO } from 'https:\/\/cdn.jsdelivr.net\/npm\/date-fns@4.1.0\/+esm';\r\nimport { tz } from 'https:\/\/cdn.jsdelivr.net\/npm\/@date-fns\/tz@1.4.1\/+esm';\r\n\r\n\/\/ \u30cb\u30e5\u30fc\u30e8\u30fc\u30af\uff1a\u590f\u6642\u9593\u958b\u59cb\u304b\u30892\u6642\u9593\u5f8c\r\nconst nyTimeStr = '2026-03-08T05:00:00'; \r\nconst nyTimeZone = 'America\/New_York';\r\n\r\n\/\/ \u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3063\u3066UTC\u3078\u9006\u7b97\r\nconst nySafeTzDate = parseISO(nyTimeStr, { in: tz(nyTimeZone) });\r\nconst nySafeDate = new Date(nySafeTzDate.getTime());\r\n\r\n\/\/ \u78ba\u8a8d\u306e\u305f\u3081\u3001\u6a19\u6e96\u6a5f\u80fd\u3067\u30ed\u30fc\u30ab\u30eb\u6642\u9593\u306b\u623b\u3057\u3066\u51fa\u529b\r\nconsole.log(nySafeDate.toLocaleString('ja-JP', { timeZone: nyTimeZone }));\r\n\/\/ \u51fa\u529b\u4f8b: 2026\/3\/8 5:00:00\r\n<\/code><\/pre>\n
    \u691c\u8a3c\u306e\u7d50\u679c\u3001\u3069\u3061\u3089\u306e\u30b1\u30fc\u30b9\u306b\u304a\u3044\u3066\u3082\u5b9f\u884c\u74b0\u5883\u306e\u6642\u5dee\u306b\u5f71\u97ff\u3055\u308c\u308b\u3053\u3068\u306a\u304f\u3001\u6307\u5b9a\u3057\u305f\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u306e\u30eb\u30fc\u30eb\u306b\u5f93\u3063\u3066\u6b63\u78ba\u306aUTC\u304c\u9006\u7b97\u3067\u304d\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n
    \u304a\u308f\u308a\u306b\uff1a\u9069\u6750\u9069\u6240\u3067\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u6d3b\u7528<\/h2>\n
    \u51683\u56de\u306b\u308f\u305f\u3063\u3066\u3001JavaScript\u3067\u306e\u6642\u5dee\u8a08\u7b97\u306b\u3064\u3044\u3066\u6398\u308a\u4e0b\u3052\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n
    \u300c\u6a19\u6e96\u6a5f\u80fd\u3060\u3051\u3067\u3069\u3053\u307e\u3067\u5b9f\u88c5\u3067\u304d\u308b\u304b\u300d\u3092\u8a66\u307f\u308b\u3053\u3068\u306f\u3001\u30a8\u30f3\u30b8\u30cb\u30a2\u3068\u3057\u3066\u4ed5\u7d44\u307f\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u5927\u5207\u306a\u30d7\u30ed\u30bb\u30b9\u3060\u3068\u611f\u3058\u3066\u3044\u307e\u3059\u3002\u691c\u8a3c\u306e\u7d50\u679c\u3001UTC\u304b\u3089\u5404\u90fd\u5e02\u306e\u6642\u523b\u3092\u8868\u793a\u3059\u308b\u51e6\u7406\u306f\u6a19\u6e96\u6a5f\u80fd\u3067\u5341\u5206\u5bfe\u5fdc\u53ef\u80fd\u3067\u3059\u304c\u3001\u300c\u7279\u5b9a\u306e\u30ed\u30fc\u30ab\u30eb\u6642\u523b\u304b\u3089UTC\u3092\u9006\u7b97\u3059\u308b\u300d\u3068\u3044\u3046\u51e6\u7406\u306b\u304a\u3044\u3066\u306f\u3001\u3059\u3079\u3066\u3092\u81ea\u524d\u306e\u30ed\u30b8\u30c3\u30af\u3067\u30ab\u30d0\u30fc\u3057\u3088\u3046\u3068\u3059\u308b\u306e\u306f\u30d0\u30b0\u306e\u30ea\u30b9\u30af\u3092\u9ad8\u3081\u308b\u8981\u56e0\u306b\u306a\u308b\u3068\u5224\u65ad\u3057\u307e\u3057\u305f\u3002<\/p>\n
    \u3082\u3057\u3001Web\u30a2\u30d7\u30ea\u3067\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u3092\u307e\u305f\u3044\u3060\u65e5\u6642\u306e\u8a08\u7b97\u3092\u5b9f\u88c5\u3059\u308b\u6a5f\u4f1a\u304c\u3042\u308a\u3001\u539f\u56e0\u4e0d\u660e\u306e\u6642\u9593\u306e\u30ba\u30ec\u306b\u60a9\u307e\u3055\u308c\u305f\u6642\u306f\u3001\u3053\u306e\u8a18\u4e8b\u3067\u89e6\u308c\u305f\u300c\u5b9f\u884c\u74b0\u5883\u306e\u6642\u5dee\u300d\u3084\u300c\u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u306e\u7f60\u300d\u3092\u601d\u3044\u51fa\u3057\u3001\u6a19\u6e96\u6a5f\u80fd\u3068\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u9069\u6750\u9069\u6240\u3067\u4f7f\u3044\u5206\u3051\u308b\u9078\u629e\u80a2\u3092\u691c\u8a0e\u3057\u3066\u307f\u3066\u306f\u3044\u304b\u304c\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
    <\/p>","protected":false},"author":2,"featured_media":0,"template":"","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"class_list":["post-10259","blog","type-blog","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/randyapps.com\/ja\/wp-json\/wp\/v2\/blog\/10259","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/randyapps.com\/ja\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/randyapps.com\/ja\/wp-json\/wp\/v2\/types\/blog"}],"author":[{"embeddable":true,"href":"https:\/\/randyapps.com\/ja\/wp-json\/wp\/v2\/users\/2"}],"wp:attachment":[{"href":"https:\/\/randyapps.com\/ja\/wp-json\/wp\/v2\/media?parent=10259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}