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世界時計計算機

2つのUTCオフセット間で日時を変換します。

はじめに

World Time Calculator — Convert a date and time between two UTC offsets. Enter Date/time, From UTC offset (hours), To UTC offset (hours) to get an instant, accurate result.

計算式

Converts a date/time from a source UTC offset to UTC, then applies the target UTC offset, reporting whether the result lands on the previous, same, or next calendar day.

ステップごとの説明

  1. Enter the Date/time.
  2. Enter the From UTC offset (hours).
  3. Enter the To UTC offset (hours).
  4. Click Calculate to see your result instantly.

実例

Example: With Date/time = 2026-10-09 12:00:00, From UTC offset (hours) = 0, To UTC offset (hours) = 5.5, the World Time Calculator gives Source Time: 2026-10-09 12:00:00, Utc Time: 2026-10-09 12:00:00, Target Time: 2026-10-09 17:30:00.

よくある質問

Does this account for daylight saving time?
No, it uses the fixed UTC offset you enter — during DST you may need to adjust the offset manually for that region.
Why does the date sometimes shift?
Crossing enough time zones can push the converted time into the previous or next calendar day, which is shown as a day offset.
What inputs does the World Time Calculator need?
You'll need to provide: Date/time, From UTC offset (hours), To UTC offset (hours). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the World Time Calculator?
The World Time Calculator applies the formula exactly as calculated — Converts a date/time from a source UTC offset to UTC, then applies the target UTC offset, reporting whether the result lands on the previous, same, or next calendar day. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the World Time Calculator free to use?
Yes, the World Time Calculator is completely free, requires no signup, and runs instantly in your browser.

世界時計計算機について

The World Time Calculator uses a real, verifiable formula — Converts a date/time from a source UTC offset to UTC, then applies the target UTC offset, reporting whether the result lands on the previous, same, or next calendar day. — so results are accurate every time, not an approximation.