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世界時計

ライブ世界時計

国別の現地時間を確認するか、基準時刻で最大4つのタイムゾーンを比較できます。

250か国以上の正確な現地時間

Countries TimeはIANA/zoneinfoデータベースからリアルタイムで時刻を計算します。各国の現在時刻とIANAタイムゾーンを確認し、最大4ゾーンを同一UTC基準時刻で比較できます。

When to use a world clock

Countries Time helps whenever you need trustworthy local time without installing an app or creating an account.

  • Travel and layovers

    Check whether it is morning or night at your destination before calling home, booking a taxi, or planning a same-day connection.

  • Remote teams

    Find overlap windows for stand-ups and reviews when colleagues sit in different continents. Set a reference time and see everyone's local equivalent instantly.

  • International calls

    Avoid ringing someone at dinner time. Open a country page, confirm DST, then use the comparator to test a proposed meeting hour across zones.

How it works

  1. Pick a country from the directory or a featured clock below.
  2. Read the live local time, IANA zone label, and editorial notes about DST.
  3. Open the comparator to project one reference date and time onto up to four countries.

Live clocks — frequently viewed

よくある質問

世界時計はどのように動作しますか?
UTCの基準時刻を各国の有効なIANAゾーンに変換するため、夏時間の変更も含め常に現地の現在時刻を表示できます。
タイムゾーンを比較するには?
比較ツールを開き、最大4か国を選んで基準時刻を設定すると、同じ瞬間が各ゾーンでどうなるか確認できます。
表示時刻が年間を通して変わるのはなぜですか?
多くの地域では年2回UTCオフセットが変わります。公式zoneinfoルールを各移行時に適用しています。
Where does the time data come from?
We convert a single UTC instant using IANA time zone identifiers (zoneinfo). Rules include historical and future daylight saving transitions published in the tz database.
Does Countries Time replace official government time?
No. We provide an independent reference for everyday scheduling. For legally binding timestamps, rely on official sources in each jurisdiction.
Can I compare more than four countries?
The comparator supports two to four countries at once to keep results readable. You can run multiple comparisons or browse individual country pages for additional zones.