Time & Date
Date Calculator
Add or subtract days from a date
Created and maintained by: CalcTago Editorial TeamLast updated: 2026-02-08
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
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Frequently asked questions
What does the Date Calculator do?
It helps you add or subtract days from a date.
What inputs do I need?
Enter Start date and Days to add.
Are decimals supported?
Yes, you can use decimal values where appropriate.
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About this tool
This Date Calculator turns your inputs into practical results. Provide Start date and Days to add to calculate Result date and Weekday.
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.