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計算

日付差計算機

無料の日付差計算機。2つの日付間の正確な差を、年、月、週、日、時間、分単位で取得します。プロジェクト、記念日、計画に。

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Understanding · Subtracting two dates is harder than it looks.

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.

How many days between two dates?

Pick the start and end date — we count the days, including or excluding the end date depending on your preference.

Does it count the start and end day?

By default we count the gap between dates (inclusive of one endpoint). For exact day counts (both endpoints inclusive) add 1.

How are months and years computed?

We give you both: a 'calendar' breakdown (e.g. 1 year 2 months 3 days) and totals in days, weeks, etc. The breakdown follows civil calendar rules.

Does it handle leap years?

Yes — leap years are accounted for in all calculations.

Is the calculator free?

Yes — fully free, no signup, runs in your browser.

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