Days Between Dates Calculator
A days between dates calculator counts the exact number of calendar days, weeks, months, and leap days elapsed between two selected dates. Operating on standard Gregorian calendar algorithms, it accurately calculates the exact duration between dates, such as identifying 90 calendar days between January 1 and April 1.
By Daniel Okoro (Mathematics Editor) · Reviewed by Maya ChenUpdated · Published
Presets:
CALENDAR DAYS ELAPSED
Equal to 4 weeks and 2 days (720 hours).
Full Weeks:4 Weeks
Remaining Days:2 Days
Total Hours:720 hrs
How Does the Days Between Dates Calculator Work?
- Select your starting calendar date.
- Select your ending calendar date.
- Choose whether to include the end date in the total count.
What Is the Days Between Dates Formula?
Days = (End Date - Start Date) / (1000 × 60 × 60 × 24)
Subtract start timestamp from end timestamp in milliseconds and convert to whole days.
Variables
Days:Total calendar days elapsed
How Do You Calculate Days Between Dates Step by Step?
Counting days between June 1, 2026 and August 15, 2026Start Date: 2026-06-01
End Date: 2026-08-15
June: 29 remaining days
July: 31 full days
August: 15 days
Total: 29 + 31 + 15 = 75 days (10 weeks and 5 days)
Final Solution:75 days (10 weeks, 5 days)
Days Between Dates Questions and Answers
Yes, full calendar leap years (29 days in February) are automatically calculated using standard astronomical Gregorian rules.
Where Do These Days Between Dates Standards Come From?
Related Calculators & Converters
Date Difference Calculator
View exact chronological time intervals between two dates broken down into years, months, and days.
Days From Today Calculator
Instantly determine future or past calendar dates by adding or subtracting days, weeks, or months from today.
Business Days Calculator
Calculate work days between two calendar dates excluding weekends, or project forward to find a deadline date based on business days.
Age Calculator
Calculate exact chronological age from date of birth down to the day, hour, and minute, plus days remaining until next birthday.