Days Between Dates Calculator
Perfect for calculating lengths of projects, events, or periods between historical records.
0
Day(s)
Exclusive of the start date.
0.000
Weeks
0.000
Approx months
0.0000
Approx years
How to Use This Calculator
Pick start and end dates
Choose any two calendar dates—past or future.
Select counting method
Include both dates when needed (e.g., multi-day events).
Review the breakdown
Use days, weeks, and approximate months/years for planning or reporting.
Formula
Exclusive Days = End Date − Start Date
Inclusive Days = (End Date − Start Date) + 1
Weeks = |Days| ÷ 7
Example: Exclusive difference 2025-01-01 → 2025-01-05 = 4 days; inclusive = 5 days.
Use Cases
- Calculate project durations or sprint lengths.
- Plan travel itineraries or event schedules.
- Measure time between medical appointments or follow-ups.
- Track residency or service requirements counted in days.
Frequently Asked Questions
Does the calculator handle negative results?
Yes—if the end date is before the start, the result is negative (days elapsed).
Can I account for business days?
This tool counts calendar days. Use a business day calculator to exclude weekends and holidays.
Are leap years included?
Absolutely—calendar calculations incorporate leap years automatically.
How do I convert to hours?
Multiply the day result by 24 (or use the Countdown Calculator for precise hours/minutes).