CrateX.app

日付計算機

2つの日付の間の日数、または日付への年・月・週・日の加算と減算を計算します。

Select Calculation

Use this when you need the number of calendar days between two dates.

Start date

End date

Include end date

Result

Select Calculation

Use this when you need the number of calendar days between two dates.

日付計算機

かんたんスタート

Choose whether you need a day gap, a date after adding time, or a date after subtracting time.

For date difference, enter start and end dates. For date math, enter a start date and the units to add or subtract.

Results update instantly. Date difference excludes the end date unless you turn on inclusive mode.

add 14 days, 6 weeks, or 3 months to find a target date.

count how many calendar days sit between two dates.

subtract a preparation window from a target date.

When a target month has no matching day, the result is clamped to the last day of that month.

Inclusive mode is for workflows that count the ending day as a full day.

Dates are handled as YYYY-MM-DD calendar dates to avoid timezone shifts.

This version does not exclude weekends or holidays, so it is not a business-day calculator.

It does not handle time-of-day or timezone conversion; use the timestamp converter for exact instants.

Contracts, payments, and legal deadlines can define their own counting rules.

Dates are calculated locally in your browser and are not uploaded.

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