[{"data":1,"prerenderedAt":189},["ShallowReactive",2],{"page:/zh-TW/guides/time-zones-and-dst/":3},{"id":4,"title":5,"body":6,"description":175,"extension":176,"eyebrow":177,"faq":178,"locale":179,"meta":180,"navigation":181,"pageType":182,"path":183,"related":178,"seo":184,"stem":187,"__hash__":188},"pages/zh-TW/guides/time-zones-and-dst.md","時區與日光節約時間",{"type":7,"value":8,"toc":163},"minimark",[9,13,17,20,23,26,29,32,35,38,94,117,120,123,130,134,137,148,151],[10,11,12],"h2",{"id":12},"絕對時刻與牆上時間",[14,15,16],"p",{},"絕對時刻是唯一的；本地牆上時間可能有歧義，因為它把日曆欄位與地區規則組合在一起。從時間戳轉換到某個時區是確定的，而從本地日期轉換為時間戳有時必須作出選擇。",[10,18,19],{"id":19},"缺口與重疊",[14,21,22],{},"時鐘向前撥時，部分本地時間從未發生；向後撥時，一段本地時間會以不同 UTC 偏移出現兩次。可靠的排程介面應拒絕缺口，並要求使用者為重疊時間選擇偏移。",[10,24,25],{"id":25},"儲存正確的資訊",[14,27,28],{},"記錄過去事件時，應儲存絕對時刻。安排未來重複事件時，通常還要儲存 IANA 時區，因為未來偏移可能隨規則改變。固定偏移無法表達一個地區的完整規則。",[10,30,31],{"id":31},"測試建議",[14,33,34],{},"測試日光節約時間切換前後、UTC 跨日，以及瀏覽器與後端時區資料庫版本不同的情況。不要用目前偏移推算全年日期，也不要把城市名稱當作固定小時差。",[10,36,37],{"id":37},"紐約日光節約時間的範例",[39,40,41,57],"table",{},[42,43,44],"thead",{},[45,46,47,51,54],"tr",{},[48,49,50],"th",{},"當地日期與鐘點",[48,52,53],{},"發生什麼",[48,55,56],{},"如何處理",[58,59,60,72,83],"tbody",{},[45,61,62,66,69],{},[63,64,65],"td",{},"2024-03-10 02:30",[63,67,68],{},"春季調快時鐘跳過這段",[63,70,71],{},"改用存在的鐘點",[45,73,74,77,80],{},[63,75,76],{},"2024-11-03 01:30",[63,78,79],{},"秋季調慢時鐘後出現兩次",[63,81,82],{},"選擇 UTC−04:00 或 UTC−05:00",[45,84,85,88,91],{},[63,86,87],{},"2024-11-03 03:00",[63,89,90],{},"只出現一次",[63,92,93],{},"正常轉換",[14,95,96,97,101,102,105,106,111,112,116],{},"重複的 01:30，較早一次為 ",[98,99,100],"code",{},"2024-11-03T05:30:00Z","，較晚一次為 ",[98,103,104],{},"2024-11-03T06:30:00Z","，兩者都有效。程式若自行挑選，會議可能與原意相差一小時。可在",[107,108,110],"a",{"href":109},"/zh-TW/date-to-timestamp/","日期轉時間戳","或",[107,113,115],{"href":114},"/zh-TW/world-time-converter/","兩個時區時間轉換","驗證。",[10,118,119],{"id":119},"太平洋標準時間與洛杉磯當地時間",[14,121,122],{},"PST 固定表示 UTC−08:00。洛杉磯日光節約時間期間使用 PDT，即 UTC−07:00。北京目前全年採用 UTC+08:00，因此洛杉磯在標準時間期間通常慢 16 小時，在日光節約時間期間慢 15 小時。",[14,124,125,126,129],{},"北京時間 2026 年 10 月 13 日 09:26，對應洛杉磯 10 月 12 日 18:26。",[98,127,128],{},"America/Los_Angeles"," 會依當日規則計算；全年固定使用 PST 則得到 17:26，無法代表實際當地鐘點。",[10,131,133],{"id":132},"安排未來活動要檢查什麼","安排未來活動要檢查什麼？",[14,135,136],{},"輸入活動的實際日期，來源與目標皆選擇城市或 IANA 時區，並核對是否跨到前一天或後一天。週期性會議應保存來源時區，不能只保存今天的偏移。規則可能因政策改變，重要未來安排需配合更新的時區資料核對。",[14,138,139,143,144,147],{},[107,140,142],{"href":141},"/zh-TW/time-zone-converter/","時間戳轉時區","顯示已確定的時刻；",[107,145,146],{"href":114},"兩地時間轉換","還需先解讀來源鐘點，兩者用途不同。",[10,149,150],{"id":150},"標準與執行環境參考",[152,153,154],"ul",{},[155,156,157],"li",{},[107,158,162],{"href":159,"rel":160},"https://www.iana.org/time-zones",[161],"nofollow","IANA Time Zone Database",{"title":164,"searchDepth":165,"depth":165,"links":166},"",2,[167,168,169,170,171,172,173,174],{"id":12,"depth":165,"text":12},{"id":19,"depth":165,"text":19},{"id":25,"depth":165,"text":25},{"id":31,"depth":165,"text":31},{"id":37,"depth":165,"text":37},{"id":119,"depth":165,"text":119},{"id":132,"depth":165,"text":133},{"id":150,"depth":165,"text":150},"理解 UTC 偏移、IANA 時區、日光節約時間切換造成的不存在時間和重複時間。","md","指南 / 時區",null,"zh-TW",{},true,"guide","/zh-tw/guides/time-zones-and-dst",{"title":185,"description":186},"Unix 時間戳、時區與日光節約時間 — 避免轉換錯誤","了解 UTC 偏移與命名時區的差異，以及時間缺口和重複時間如何影響日期轉時間戳。","zh-TW/guides/time-zones-and-dst","CSjIlqw7-FxCNqBx2mDobdar2fVJAS0Va8KVd-b_JfE",1792032488399]