Date Calculator
Calculate date differences, age, and business days
Date Difference
Calculate the difference between two dates
Difference
Tips
- • Date formats follow your browser's locale settings
- • Business days calculator counts only weekdays when "Exclude weekends" is checked
- • Age calculator shows exact age down to the day
- • All calculations account for leap years
How to Use
- 1
Select calculation mode
Choose from Date Difference, Add/Subtract Dates, Age Calculator, or Business Days
- 2
Enter your dates
Input the required dates using the date pickers or type them manually
- 3
Configure options
Set any additional options like units for addition/subtraction or weekend exclusion
- 4
View results
See your calculated results instantly with multiple unit breakdowns
Frequently Asked Questions
How are dates calculated across different months?
How are dates calculated across different months?
The calculator accounts for different month lengths and leap years. When adding months, if the target date doesn't exist (like February 31st), it adjusts to the last valid day of that month.
What is the difference between calendar days and business days?
What is the difference between calendar days and business days?
Calendar days include all days (weekends and weekdays), while business days typically exclude weekends (Saturday and Sunday). Some calculators also exclude public holidays, but this calculator focuses on weekday calculations only.
How accurate is the age calculator?
How accurate is the age calculator?
The age calculator provides exact calculations down to the day, accounting for leap years and varying month lengths. It shows your age in years, months, and days, as well as total days, weeks, and months lived.
Can I calculate dates before 1900 or after 2100?
Can I calculate dates before 1900 or after 2100?
Yes, the calculator supports a wide range of dates. However, very old dates should be used with caution as calendar systems have changed throughout history (like the switch from Julian to Gregorian calendar).