期間計算ツール

Calculate duration between times, add/subtract duration, convert time units, and find elapsed time with step-by-step solutions.

Your Input

形式: HH:MM または HH:MM:SS (例: 09:00 または 09:00:00)

翌日も可（例：23:00～02:00）

Select a calculation type, enter your times or duration, then click Calculate to see results with step-by-step solution and visualization.

完全なユーザーガイド

持続時間とは何ですか?

Time duration is the amount of time that passes between two points in time, or the length of time something takes. This calculator finds duration between two clock times, adds or subtracts duration from a time, converts between time units, and computes end time from a start time and elapsed duration.

Time format: HH:MM or HH:MM:SS (24-hour)

時間の形式

HH:MM: 時間:分 (例: 14:30)

HH:MM:SS: 時:分:秒 (例: 14:30:45)

Use 24-hour format (0-23 hours).

計算の種類

時間間の継続時間

Enter start and end time; duration can cross midnight.

期間の加算/減算

Add or subtract hours, minutes, seconds, or days from a given time.

期間単位の変換

Convert between seconds, minutes, hours, days, weeks, months, and years.

経過時間を計算する

From a start time and elapsed duration, get the end time.

この計算機の使い方

  1. Select calculation type from the dropdown.
  2. Enter time values (HH:MM or HH:MM:SS) or duration and units in the form.
  3. Click Calculate to see the result, detail cards, visualization (when available), and step-by-step solution.
  4. Click Reset to clear inputs and results.

重要な注意事項

  • Use 24-hour format (0-23 hours). Duration can cross midnight.
  • Subtracting duration may wrap to the previous day. All calculations use seconds internally.
  • Months and years are approximate (30 and 365 days).

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