Date Calculator

Calculate days between dates, add or subtract days from a date

Start date

End date

Include the end date in calculation (+1 day)

What Is the Date Calculator?

Our comprehensive date calculator lets you perform three essential date calculations:

• Count Days: Calculate the exact number of days between two dates, with an option to include the end date.
• Add Days: Add a specific number of days to any date to find a future date.
• Subtract Days: Subtract a specific number of days from any date to find a past date.

How to Use the Date Calculator

📅

Calculate Date Difference

Select Start Date: Click the first date picker to choose your starting date
Select End Date: Click the second date picker to choose your ending date
View Results: See the difference in years, months, days, and total days
Detailed Breakdown: Get precise calculations including business days
Copy Results: Click to copy the calculated difference to clipboard

➕

Add/Subtract Days

Choose Base Date: Select your starting date using the date picker
Enter Number: Type the number of days to add or subtract
Select Operation: Choose to add (+) or subtract (-) days
Get Result: See the calculated future or past date instantly
Plan Ahead: Perfect for calculating deadlines and schedules

🎂

Age Calculation

Exact Age: Calculate your precise age in years, months, and days
Birth Date to Today: Use current date as end date for age calculation
Future Age: Calculate how old you'll be on a specific future date
Multiple Formats: View age in different time units
Leap Year Support: Accurate calculations including leap year handling

💼

Business Use Cases

Project Planning: Calculate project durations and milestones
Contract Terms: Determine contract periods and renewal dates
Employee Benefits: Calculate vacation days and employment periods
Invoice Due Dates: Add payment terms to invoice dates
Event Planning: Calculate event preparation timelines

📊 Popular Calculations

Personal: Age calculation, birthday countdowns, anniversary dates, vacation planning

Business: Project timelines, contract periods, payment due dates, employee tenure

Academic: Semester lengths, assignment due dates, graduation timelines, exam schedules

Health: Pregnancy due dates, medication schedules, treatment timelines