Date Calculator
Calculate the number of days between two dates, or add and subtract days from any date. Fast, free, and accurate.
Days Between Two Dates
Enter two dates to calculate the exact difference in days, weeks, months, and years.
Total Days
Weeks
Months
Years
Add or Subtract Days
Enter a date and the number of days to add or subtract. Use negative numbers to subtract days.
Resulting Date
How to Use the Date Calculator
Calculate Days Between Dates
- Enter your start date using the date picker
- Enter your end date
- Click "Calculate Difference"
- View the results showing total days, weeks, months, and years
Add or Subtract Days
- Enter a starting date
- Enter the number of days to add (positive) or subtract (negative)
- Optionally check "Business days only" to skip weekends
- Click "Calculate Date" to see the resulting date
Real-World Use Cases
Project Deadlines
Calculate how many days remain until your project deadline, or determine what date you need to start to meet a deadline with a specific number of working days.
Event Planning
Find out exactly how many days until a wedding, vacation, or special event. Plan milestones by calculating dates for RSVPs, final payments, and preparations.
Contract & Legal Dates
Calculate notice periods, warranty expiration dates, or contract renewal deadlines. Many legal documents specify timeframes in business days.
About Our Date Calculator
Our free online date calculator is a powerful tool designed to help you perform various date calculations quickly and accurately. Whether you need to find the number of days between two dates, calculate a future date by adding days, or determine how many business days fall within a specific period, this calculator has you covered.
The date calculator is particularly useful for project managers tracking deadlines, HR professionals calculating notice periods, event planners counting down to special occasions, and anyone who needs to work with dates regularly. All calculations are performed instantly in your browser, ensuring both speed and privacy.
Understanding Date Calculations
When calculating the difference between two dates, our tool provides comprehensive results. You'll see the total number of days, which is then broken down into weeks, months, and years for easier comprehension. For example, if you're calculating days until an event that's 100 days away, you'll also see that's approximately 14 weeks and 2 days, or about 3 months and 10 days.
The business days calculator feature is especially valuable for professional use. Business days exclude weekends (Saturday and Sunday), which is important for calculating delivery times, processing periods, or any timeline specified in working days. Many contracts and legal documents specify timeframes in business days, making this feature essential for accurate planning.
Adding and Subtracting Days
The add/subtract days feature allows you to determine a future or past date based on a starting point. Simply enter your starting date and specify how many days to add (use a positive number) or subtract (use a negative number). This is perfect for calculating due dates, planning ahead, or looking back in time.
With the business days option enabled, the calculator will skip weekends when counting days. For instance, if you add 5 business days to a Friday, the result will be the following Friday (skipping Saturday and Sunday), not the following Wednesday as it would be with regular days.
Accurate and Reliable
Our date calculator correctly handles all date complexities, including leap years (years with 366 days instead of 365), varying month lengths, and date calculations spanning multiple years. The calculations use your device's built-in date functions, ensuring accuracy according to the Gregorian calendar used worldwide.