Calculate days between two dates, add or subtract days from any date, and find your exact age in years, months, and days — free, instant, and 100% private.
| Period | Exact Days | Notes |
|---|---|---|
| 1 week | 7 days | Always exact |
| 1 month | 28–31 days | Varies by month |
| 1 quarter | 90–92 days | Q1–Q4 vary |
| 1 year | 365 or 366 | 366 in leap years |
| 10 years | ~3,652 | Includes leap years |
Select Days Between, Add/Subtract, or Age Calculator.
Use date pickers to select your dates and options.
Click Calculate or press Enter for instant results.
View days, weeks, months, years, and business days.
💡 Pro Tip: Use the Swap Dates button to instantly reverse start and end dates — great for checking deadlines in both directions.
Find exact days, weeks, months, and years between any two dates — with business days option.
Calculate future or past dates by adding or subtracting years, months, and days.
Get exact age in years, months, days — plus total days lived and next birthday countdown.
Exclude weekends for project deadlines, invoices, and legal notice calculations.
This date calculator runs entirely in your web browser. No data is ever transmitted, stored, or logged by our servers. All calculations are instant and completely private.