Date Calculator - Add/Subtract Days & Calculate Date Difference
Free online tool to calculate date additions, subtractions, and differences
Add/Subtract Days Calculator
Positive numbers for future dates, negative for past dates
Date Difference Calculator
How to Use This Date Calculator
Add/Subtract Days Calculator
- Select a start date or use today's date
- Enter the number of days to add or subtract
- Click "Calculate Result" to get the new date
Date Difference Calculator
- Select a start date and an end date
- Click "Calculate Difference" to get the days between dates
- View results in days, hours, and weeks
Multiple Date Formats
Supports various date formats including MM/DD/YYYY and YYYY-MM-DD
Accurate Calculations
Precise date calculations accounting for leap years and time zones
Privacy Protection
All calculations happen locally in your browser for maximum privacy
Date Calculator FAQs
Q: Can this date calculator handle business days?
A: Currently, we calculate calendar days. Business day calculation will be added in a future update.
Q: Can I subtract days from a date?
A: Yes! Simply enter a negative number in the days field to calculate past dates.
Q: How accurate are the calculations?
A: Our date calculator uses precise algorithms that account for leap years, time zones, and daylight saving time.
What Users Say
John S.
"I use this tool weekly for project planning. The most reliable date calculator I've found!"
Maria K.
"Perfect for calculating due dates and deadlines. Saves me so much time!"
David R.
"The clean interface makes date calculations effortless. Great for both personal and professional use."