Date Calculator
Add or subtract days, weeks, months, or years from any date. Find future and past dates instantly.
How to Use the Date Calculator
- Select the Add/Subtract Days tab to find a future or past date.
- Enter a start date and the number of days to add or subtract.
- Check Subtract if you want to go back in time.
- Use the Date Difference tab to calculate days between two dates.
Formula & Method
Add/Subtract Days: Uses JavaScript Date object manipulation to add or subtract days from a given date.
Date Difference: Calculates milliseconds between dates, then converts to days, weeks, months, and years.
Examples
| Start Date | Operation | Days | Result |
|---|---|---|---|
| 2025-01-01 | Add | 90 | April 1, 2025 |
| 2025-06-15 | Subtract | 30 | May 16, 2025 |
Frequently Asked Questions
Does it account for leap years?
Yes, leap years are automatically handled by the date calculations.
Can I calculate business days only?
Not yet; this shows total calendar days including weekends.
What is the difference between this and date-difference?
Date Calculator adds/subtracts days from a date; Date Difference finds days between two dates.
Does it work with historical dates?
Yes, any valid date within JavaScript date range works.
Can I add months or years?
Currently supports days only; months and years will be added in a future update.
People Also Ask
How accurate is this calculator?
Our calculators use standard mathematical formulas and provide accurate results.
Can I use this on my phone?
Yes, all tools are fully responsive and work on any device.