計算
タイムゾーン変換機
無料のタイムゾーン変換機。IANAタイムゾーン間で、完全なDST処理を伴ってあらゆる日時を変換します。地域をまたぐ会議のスケジュール調整に最適。
From any city, to any city, at any moment.
Around the world, at this moment
- 🇺🇸Los Angeles (Pacific)01:09
- 🇺🇸Denver (Mountain)02:09
- 🇺🇸Chicago (Central)03:09
- 🇺🇸New York (Eastern)04:09
- 🇨🇦Toronto (Eastern)04:09
- 🇧🇷São Paulo05:09
- 🇬🇧London09:09
- 🇫🇷Paris10:09
- 🇩🇪Berlin10:09
- 🇷🇺Moscow11:09
- 🇪🇬Cairo11:09
- 🇳🇬Lagos09:09
- 🇿🇦Johannesburg10:09
- 🇦🇪Dubai12:09
- 🇵🇰Karachi13:09
- 🇮🇳Mumbai / Delhi13:39
- 🇹🇭Bangkok15:09
- 🇸🇬Singapore16:09
- 🇨🇳Shanghai16:09
- 🇭🇰Hong Kong16:09
- 🇯🇵Tokyo17:09
- 🇰🇷Seoul17:09
- 🇦🇺Sydney18:09
- 🇳🇿Auckland20:09
- 🇺🇸Honolulu (Hawaii)22:09
Times use the IANA database your browser already ships with. Daylight saving transitions, half-hour offsets, and historical changes are all handled — no network call needed.
編集者注
Understanding · Same instant, different clocks.
この詳細な解説章は現在、英語版のみで提供されています。上の変換ツールはあなたの言語で動作しますが、長文の解説記事はまだ翻訳されていません。
よくある質問
Quick answers.
›Which timezones are supported?
All IANA zones — over 400 of them, including legacy aliases. Same data set used by every modern operating system.
›Does it handle daylight saving?
Yes. We use your browser's IANA timezone database, which knows DST start/end dates for every zone past and future.
›What's the difference between EST and EDT?
EST is Eastern Standard Time (UTC-5, winter). EDT is Eastern Daylight Time (UTC-4, summer). Use 'America/New_York' to get the right one automatically.
›Why does my conversion differ from another tool by 1 hour?
Almost always a DST mismatch. Check that both tools use the same date — the offset can change overnight when DST starts or ends.
›Is the timezone converter free?
Yes — free, no signup, no ads, runs in your browser.
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