期間計算ツール
Calculate duration between times, add or subtract durations, convert between time units, and find elapsed time — with step-by-step solutions.
計算する
Select a calculation type, enter your values, and click Calculate to see results with step-by-step solution.
結果
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段階的な解決策
完全なユーザーガイド
What Is Time Duration?
Time duration is the amount of time that passes between two points, or the length of a time interval. This calculator finds duration between clock times, adds or subtracts duration from a time, converts between 7 time units (seconds to years), and computes end time from a start time and elapsed duration — with automatic midnight-crossing support.
4 Calculation Types
時間間の継続時間
Enter start and end time. Duration can cross midnight. Shows result in seconds, minutes, hours, and days.
Add / Subtract
Add or subtract hours, minutes, seconds, or days from any clock time.
単位の変換
Convert between seconds, minutes, hours, days, weeks, months, and years.
Elapsed Time
From a start time and elapsed duration, find when it ends. Shows days elapsed.
Key Formulas
間隔： End − Start (または 86400 − Start + End)
追加： Time + Duration → mod 86400
Convert: Value × FromFactor ÷ ToFactor
Elapsed: Start + Duration = End
重要な注意事項
- 24 時間形式を使用します: 0:00 ～ 23:59。真夜中の交差点は自動的に処理されます。
- Months and years are approximate: 1 month = 30 days, 1 year = 365 days.
- 経過時間は、終了時刻が何日後になるかを示します。