This date calculator helps you perform various date-related calculations including finding the difference between dates, adding or subtracting days, calculating working days, determining age, and finding week numbers.

Calculation Types:

Date Difference:

Calculates days, weeks, months, and years between dates
Includes total days and business days
Accounts for leap years automatically

Add/Subtract Days:

Add or subtract any number of days from a date
Useful for project deadlines and scheduling
Handles month and year boundaries correctly

Working Days Calculator:

Calculates business days excluding weekends
Useful for project planning and delivery estimates
Can include or exclude weekends

Age Calculator:

Calculates exact age in years, months, and days
Can calculate age as of any specific date
Accounts for leap years in age calculations

Week Numbering Systems:

ISO 8601 (International):

Weeks start on Monday
Week 1 contains January 4th
Most commonly used internationally

US System:

Weeks start on Sunday
Week 1 contains January 1st
Commonly used in the United States

Important Notes:

All calculations account for leap years automatically
Working days exclude weekends (Saturday and Sunday)
Age calculations are precise to the day
Week numbers follow international standards
Date formats use ISO 8601 standard (YYYY-MM-DD)
Calculations are based on the Gregorian calendar

Date Calculator

Calculate Date Differences

Quick Examples

Date Analysis

Result

Detailed Breakdown

Additional Information

Interesting Facts

Date Tips

About Date Calculator