Date & Time
Date Difference
Calculate the exact time between two dates.
Exact Duration
Total Days
Weekdays
Weeks
Weekends
Days Per Month
February has 29 days in leap years (divisible by 4, except centuries unless divisible by 400).
Time Unit Reference
Leap Year Rules
A year is a leap year if:
- Divisible by 4, AND
- NOT divisible by 100, UNLESS
- Also divisible by 400
2000 ✓ (÷400) · 1900 ✗ (÷100 not ÷400) · 2024 ✓ (÷4) · 2100 ✗
FAQ
Frequently asked questions.
How do I calculate the difference between two dates?
To calculate the difference between two dates, enter a start date and an end date into the calculator and click Calculate. The tool instantly shows the exact difference broken down into years, months, weeks, and total days. This is far quicker and more accurate than counting manually on a calendar.
How many days are between two dates?
The number of days between two dates is found by subtracting the earlier date from the later date. Our date difference calculator does this automatically and displays the total number of calendar days. You can also toggle an option to include or exclude the end date from the count.
Can I calculate the difference in business days only?
Yes. Many date difference calculators, including this one, offer a business-days mode that excludes weekends (Saturday and Sunday) from the count. This is especially useful for project deadlines, shipping estimates, and legal or financial timelines where only working days matter.
How do I calculate someone's age from their date of birth?
Enter the person's date of birth as the start date and today's date as the end date. The calculator will return the difference in years, months, and days, giving you the precise current age. This works for any birth year, including leap years, without any manual adjustment.
What is the difference between calendar days and business days?
Calendar days count every day of the week including weekends and public holidays, while business days count only Monday through Friday. For example, a 7-calendar-day span from Monday to Sunday contains only 5 business days. Always choose the mode that matches your use case — deadlines and contracts often specify business days.
How do I calculate a date that is a certain number of days from today?
Use the 'add or subtract days' feature: enter today's date as the start date and type in the number of days you want to count forward or backward. The calculator returns the resulting date, accounting for month lengths and leap years automatically. This is handy for finding due dates, deadlines, or countdown milestones.
Does the calculator handle leap years correctly?
Yes. The date difference calculator accounts for leap years (which add an extra day in February every 4 years) automatically. This ensures the day count is accurate across multi-year spans and that dates falling in or around February 29 are handled without any error.
Last updated: August 17, 2026