Date Calculator
Add, subtract, or calculate difference between dates
Table of Contents
How to Use
- Select a start date
- Choose operation: add days, subtract days, or calculate difference
- Enter number of days or end date depending on operation
- Click calculate to see the result
Date Calculation Operations
This calculator supports three main operations:
- Add Days: Calculate a future date by adding a specific number of days to a start date
- Subtract Days: Calculate a past date by subtracting days from a start date
- Calculate Difference: Find the number of days between two dates, including business days
Understanding Business Days
Business days (also called working days) are weekdays from Monday to Friday, excluding weekends. This calculation is useful for:
- Project planning and deadlines
- Delivery time estimates
- Contract terms and agreements
- Leave and vacation planning
- Payment processing timelines
Common Use Cases
- Calculate project deadlines and milestones
- Determine payment due dates
- Plan events and celebrations
- Track subscription periods
- Calculate age or time elapsed
- Estimate delivery dates
- Schedule appointments and meetings
Frequently Asked Questions
- Does the calculator account for leap years?
- Yes, the calculator automatically accounts for leap years when adding, subtracting, or calculating differences between dates.
- What are business days?
- Business days are weekdays (Monday through Friday), excluding weekends. The calculator counts only these days when showing business days results.
- Can I calculate dates in the past?
- Yes, you can use the 'Subtract Days' operation to calculate past dates, or use 'Calculate Difference' with any two dates regardless of their order.
- How are months and years calculated?
- Months are calculated using an average of 30.44 days per month, and years use 365.25 days per year to account for leap years. These are approximations for quick reference.
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