Advanced Date Calculator
Add or subtract days from any date with business day options
Legal Disclaimer: This tool provides date calculations only. For legal deadlines or critical dates, always verify with official sources as results may vary by jurisdiction.
Tip: Use business days mode to skip weekends when calculating project deadlines!
Date Calculation Result
Starting Date:
Days Adjusted:
Calculation Mode:
-
0
Calendar days
Result Date: -
Date Information:
- Day of week: -
- Days between dates: 0
Practical Uses of Date Calculation
Project Planning
- Calculate project milestones and deadlines
- Determine review periods and follow-up dates
- Schedule phased deliverables
Personal Use
- Countdown to special events and vacations
- Track medication schedules
- Calculate subscription renewal dates
Frequently Asked Questions
How do you handle negative day values?
Negative values or subtraction operations will correctly move backward through the calendar, handling month/year transitions and leap years automatically.
What's the difference between subtract and negative values?
The subtraction operation and negative values both move backward in time. We provide both options for user preference, but they produce identical results.
How does business day subtraction work?
When subtracting business days, the calculator skips weekends while counting backward, just as it skips them when counting forward.
Can I calculate hours or minutes?
Yes! When you include time in your date input, the calculation will maintain time precision down to the minute level.
What's the maximum/minimum date range?
The calculator works with any dates within JavaScript's Date object range (approximately 270,000 years in both directions from present).