日付計算機
任意の日付に年、月、週、日、時間、分、秒を加算または減算します。締め切り計算、計画、日付計算に最適です。
上記の計算を設定して結果を確認してください
How to Add or Subtract Time
Quickly calculate future or past dates by adding or subtracting years, months, days, hours, and minutes.
1. Set Start Date
Choose your reference point. Use "Now" for real-time calculations.
2. Pick Duration
Use quick presets like "1 year" or type a custom string like "2w 3d".
3. Toggle Operation
Switch between adding or subtracting time to find future or past dates.
Complex Date Logic
Our algorithm correctly handles varying month lengths, leap years, and daylight saving time transitions.
Example: Adding 1 month to January 31st correctly results in February 28th (or 29th in a leap year).
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Frequently Asked Questions
当社の日付加算/減算計算機を使用する理由
Quick Presets
One-click durations from 15 minutes to 1 year.
カスタム期間
任意の時間単位の組み合わせを加算または減算します。
Add or Subtract
Calculate future dates or find past dates.
Export & Share
Export to calendar apps or share results instantly.