Introduction
This free date calculator helps you find the number of days, weeks, months, and years between two dates. You can also add or subtract time from any date to get a new date. It counts total days, business days, and weekend days. You can even exclude US holidays from your count. Use it to figure out deadlines, plan events, track how many days until a big date, or count workdays for a project. Just pick your dates, hit calculate, and get your answer.
How to Use Our Date Calculator
This calculator helps you find the number of days between two dates or add and subtract time from any date. Enter your dates and options below to get instant results.
Date Difference Tab
Start Date: Pick the first date you want to count from.
End Date: Pick the second date you want to count to.
Include End Day: Turn this on if you want the end date itself counted as one extra day in your total.
Holiday Settings: Click this to open holiday options. You can choose to skip US holidays and weekends when counting business days. You can also add your own custom holidays by entering a name, month, and day.
Calculate: Press this button to see the total days, business days, weekend days, and holidays between your two dates. You will also see a breakdown in years, months, weeks, hours, minutes, and seconds.
Add / Subtract Tab
Start Date: Pick the date you want to start from.
Operation: Choose Add to move forward in time or Subtract to move backward.
Years, Months, Weeks, Days: Enter how much time you want to add or subtract. You can fill in one field or all of them.
Business Days Only: Turn this on to skip weekends and holidays when counting days and weeks.
Calculate: Press this button to see your new resulting date, the day of the week it falls on, and helpful details like whether it lands in a leap year and its ISO week number.
What Is a Date Calculator?
A date calculator is a tool that helps you find the number of days, weeks, months, or years between two dates. It can also add or subtract time from any date to find a new date in the future or past. People use date calculators for many everyday tasks like counting down to a birthday, figuring out how many days until a deadline, or planning a project timeline.
How Dates and Time Work
Our calendar is called the Gregorian calendar. Most years have 365 days, but every four years we get a leap year with 366 days. Months have different lengths: some have 30 days, some have 31, and February has 28 or 29. This makes counting days by hand tricky, which is why a calculator is so helpful.
Calendar Days vs. Business Days
There are two main ways to count days. Calendar days include every single day: weekdays, weekends, and holidays. Business days only count Monday through Friday and skip weekends. Some people also skip holidays when counting business days. Business day counting is common for work deadlines, shipping times, and legal due dates.
What Are Federal Holidays?
Federal holidays are days set by the U.S. government when most offices and banks are closed. Examples include New Year's Day, Independence Day, Thanksgiving, and Christmas. Some holidays fall on a fixed date every year, while others move around, like Thanksgiving, which is always the fourth Thursday in November. When you exclude holidays from a date calculation, you get a more accurate count of actual working days.
Common Uses for Date Calculations
- Project planning: Find out how many working days you have to finish a task.
- Age calculation: See your exact age in years, months, and days with our Age Calculator.
- Contract deadlines: Count business days to know when a legal or work deadline falls.
- Travel planning: Calculate the length of a trip in days or weeks.
- Pregnancy tracking: Count weeks and days from a specific start date.
- Loan and interest periods: Find the exact number of days between payment dates.
- Countdowns: Track how many days remain until a special event with our Days Until Calculator.