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Date Calculator

Calculate days between dates, or add and subtract years, months, weeks, and days from a date.

Select Calculation

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

Result

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Select Calculation

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

Quick Start

1
Choose whether you need a day gap, a date after adding time, or a date after subtracting time.
2
For date difference, enter start and end dates. For date math, enter a start date and the units to add or subtract.
3
Results update instantly. Date difference excludes the end date unless you turn on inclusive mode.

Common Scenarios

Deadlines

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

Trip planning

count how many calendar days sit between two dates.

Backtracking

subtract a preparation window from a target date.

Usage Advice

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.

Limitations & Compatibility

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.

Privacy & Security

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

FAQ

6

Continue with these related tools for the next step.