Date Difference Calculator
The date difference calculator helps you find the exact amount of time between two dates. This powerful tool calculates days, weeks, months, and years between any two calendar dates. It's perfect for:
- Calculating age with precision
- Determining project durations
- Measuring contract periods
- Finding time elapsed since significant events
- Planning for future dates and deadlines
Our calculator handles leap years automatically, ensuring accurate results every time.
Adding or Subtracting Time
The time addition/subtraction tool allows you to calculate a future or past date by adding or subtracting specific time periods from any starting date. This feature is invaluable for:
- Planning deadlines and milestones
- Calculating subscription end dates
- Scheduling future appointments
- Determining historical dates for research
- Setting reminder periods for important tasks
You can combine years, months, weeks, and days for precise date calculations that account for varying month lengths and leap years.
Business Days Calculator
The business days calculator is essential for professional planning, computing only working days between dates while excluding weekends and optionally holidays. This specialized tool helps with:
- Project management timelines
- Estimating delivery dates
- Calculating payment due dates
- Planning business processes and workflows
- Determining business turnaround times
Our calculator supports U.S. federal holidays and provides a clear breakdown of business days for accurate workplace planning.
Leap Years Explained
A leap year has 366 days instead of 365, with an extra day added to February (February 29). This calendar adjustment keeps our calendar in alignment with the Earth's revolutions around the sun. The rules for leap years are:
- Years divisible by 4 are leap years
- Century years (ending in 00) are not leap years unless divisible by 400
- For example, 2000 was a leap year, but 1900 was not
All our date calculators automatically account for leap years to ensure accurate results for any date range you select.
How to Use These Calculators
Simply select the appropriate tab for your calculation need, enter the required dates, and click the calculate button. For date differences, you'll see a comprehensive breakdown of the time span in multiple units. When adding or subtracting time, you'll get the resulting date with its day of the week. Business day calculations will show working days with optional holiday exclusions.
These tools are free to use and work on all modern devices and browsers. No registration required!