Days Between Dates Calculator | Exact Time Calculator
Instantly calculate the precise duration between two dates. Ideal for project planning, legal deadlines, and tracking age or events.
Calculation Settings
End date is earlier than start date.
Best for project durations. Leave unchecked for counting nights.
Results Summary
Total Days
Sunrises between dates
Calendar Duration
Full Y/M/D breakdown
Working Days
Excluding weekends
Alternative Units
0 hours
0 minutes
Visual Breakdown: This chart illustrates the ratio of working days (Mon-Fri) versus weekend days (Sat-Sun) within your selected period.
How to Calculate Days Between Dates
- Identify Dates: Select your specific start and end dates in the calendar picker.
- Choose Inclusion: Decide if you want to count the final day (inclusive) or measure the gaps between dates (exclusive).
- Review Leap Years: The tool automatically checks if February 29th falls within your range.
- Analyze Result: View the total day count and check the "Working Days" section to see the business day breakdown.
The Impact of Leap Years
Calculating duration accurately requires accounting for the Earth's orbit, which takes approximately 365.25 days. To keep our calendar aligned, we add an extra day — February 29th — every four years. However, a year divisible by 100 is not a leap year unless it is also divisible by 400. This calculator automates this complex logic for any date range up to the year 9999, ensuring your count is precise.
Frequently Asked Questions
What is the difference between inclusive and exclusive counting?
Exclusive counting (default) calculates the number of nights or 'gaps' between dates. Inclusive counting includes both the first and last day.
Does this handle leap years?
Yes. The calculator logic automatically detects leap years (including the 100/400 year rules) and adds February 29th to the count where appropriate.