Add or subtract days from any date, or find the exact number of days between two dates. Results update instantly — useful for deadlines, project planning, and date-of-birth calculations.
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Result date
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Days between
Frequently Asked Questions
How do I add days to a date?
Select a start date and enter a positive number of days. The result date appears instantly. For example, 30 days after 1 January 2026 is 31 January 2026.
How do I subtract days?
Enter a negative number in the days field. For example, −7 subtracts one week from the start date.
Does the calculator account for leap years?
Yes. All calculations use actual calendar dates, so leap years and varying month lengths are handled correctly.
Can I calculate someone's age?
Yes. Use the dedicated Age Calculator for exact age in years, months, and days.
Is this tool free and does it work on mobile?
Yes on both counts. The Date Calculator on draft21 is completely free with no sign-up required and works on all devices.