Date Calculator
Add or subtract days from a date, or calculate the difference between two dates in years, months, weeks, and days.
計算機
結果
値を入力して「計算」をクリックしてください
結果はここに表示されます
Adding Days to a Date and Finding Date Differences
Use the add-days mode to add days to a date — for example, a 90 day calculator to find the date 90 days from today, a deadline, or a due date. Subtracting days works the same way in reverse. Both modes handle calendar months and leap years correctly, so adding 30 days in February and adding 30 days in January produce different results.
The difference mode acts as a days calculator from date to date: pick two dates and it reports the gap in years, months, weeks, and days. Common uses include counting the days until a vacation, working out how many days remain on a contract, and planning milestones and anniversaries.
Whether you need a date calculator in days, a month calculator for date math, or a general calendar calculator for planning, this time and date calculator covers it in one tool.
使い方
仕組み
Add or subtract days from a date, or calculate the difference between two dates in years, months, weeks, and days.
公式 / 計算方法
This calculator uses standard mathematical formulas for accurate results.
例
Try the calculator above with your own values to see personalized results.