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日付差計算機

Date difference calculator: count days, weeks, months, business and weekend days between dates with auto order handling, one-click copy and offline.

使い方

開始日と終了日を入力すると、総日数、週数、月数、平日数、週末日数が自動計算されます。日付の前後は自由に入力できます。

Overview

Date Difference Calculator is a Time tool. Count days, weeks, months, business and weekend days between dates with auto order handling, one-click copy and offline. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

  • Daily use of Date Difference Calculator: Enter start and end dates in any order; total days, weeks, months, business days and weekends update instantly. — enter and get instant results without manual lookup.
  • One-click copy keeps results ready to save, check or share with family and pros.
  • Use Date Difference Calculator offline or on poor network — all calculations stay local and private.
  • Date diff and workdays
  • Birthday and lunar reminders

How to use

  1. 1 Enter start and end dates in any order; total days, weeks, months, business days and weekends update instantly..
  2. 2 Toggle inclusive and workdays
  3. 3 View weeks/months/hours breakdown
  4. 4 Copy or add to calendar

Highlights

  • Local & private: processing stays in your browser
  • Live validation with tolerant parsing
  • One-click copy and export for docs, code or sheets
  • Batch and offline support under poor network

Notes

  • Workdays need holiday data
  • Feb 29 birthdays vary by locale
  • Seconds vs milliseconds timestamps

FAQ

Why different ages?
Years-old vs nominal age differ by region.
Lunar supported?
Yes, lunar input auto-converts to Gregorian.
How is Date Difference Calculator different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “date difference, business days” and one-click copy for reuse.
Can I use results in official reports?
Use it as a working draft and cross-check with authoritative sources; keep the exported log and parameters for traceability.
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すべての計算はブラウザ内で実行され、データはアップロードされません。