Add Days to Date Calculator
Instantly and accurately add or subtract days from any date. Free, precise tool for calculating deadlines, future dates, and exact days of the week.
Calculate Your Future or Past Date
Enter your starting date and the number of days to add below to get an instant, precise resulting date, complete with day-of-the-week validation.
Date Details
Enter your base date and duration for an accurate match
Calculation Results
Resulting date and duration details
Common Date Additions
Typical time additions to help you quickly estimate future dates without using the calculator.
| Days Added | Approximate Duration | Common Use Case |
|---|---|---|
| +7 days | 1 week | Weekly deadlines or recurring meetings |
| +14 days | 2 weeks | Standard notice periods or fortnightly cycles |
| +30 days | ~1 month | Monthly billing cycles or standard returns |
| +90 days | ~3 months | Quarterly reviews or probationary periods |
| +180 days | ~6 months | Half-year projections or visa validity checks |
| +365 days | 1 year | Annual renewals or anniversaries |
Date Calculation FAQ
Everything you need to know about adding days to a date and understanding calendar calculations.
To add days to a date, simply enter your starting date and the number of days you wish to add. The calculator will automatically account for month lengths, leap years, and provide the exact resulting date and day of the week.
Yes. To subtract days and find a past date, simply enter a negative number in the ‘Days to Add’ field (e.g., -30 to go back 30 days).
This calculator adds calendar days, meaning weekends and public holidays are included in the count. If you need to calculate business or working days only, you will need to use a dedicated business day calculator.
90 days from today is approximately 3 months. You can use this calculator by leaving the start date as today and entering ’90’ in the days field to get the exact calendar date and day of the week.