Our free date calculator helps you quickly find the number of days between two dates, calculate your exact age down to the day, or add and subtract days from any date. All calculations happen instantly in your browser — no sign-up and no downloads. Whether you need to track project deadlines, figure out rental periods, plan an upcoming event, or simply count down to a milestone, this tool gives you accurate results with a single click.
Need to know how many days are between two dates? Enter a start date and an end date to see the exact difference in years, months, and days. The calculator also shows the total number of days, weeks, months, hours, and minutes between the two dates. This is perfect for counting down to a vacation, tracking project timelines, figuring out rental periods, or calculating the duration between any two calendar dates.
Use the "Include end date" toggle when you need to count both the start and end dates in your total — for example, a rental agreement from January 1 through January 31 is 31 days inclusive. The calculator handles leap years, varying month lengths, and even century boundaries automatically. If you only need a quick day count, check out our dedicated days between dates calculator.
Calendar days count every day on the calendar — weekdays, weekends, and holidays alike. Business days (also called working days) only count Monday through Friday, excluding weekends and US federal holidays. The distinction matters for legal deadlines, shipping estimates, payroll calculations, and project planning.
Our date calculator lets you toggle between calendar days and business days with a single checkbox. When the "Business days only" option is enabled, weekends and all 10 US federal holidays are automatically excluded from the count. This is especially useful if you need to calculate delivery windows, payment terms (such as "Net 30 business days"), or compliance deadlines that specify working days. You can combine it with the "Include end date" toggle for full flexibility.
Enter your date of birth to find your exact age in years, months, and days. The age calculator also tells you the total number of days you've been alive, which day of the week you were born on, and how many days until your next birthday. This is useful for birthday planning, verifying identification documents, or satisfying curiosity about exactly how long you've been alive.
Start from any date and add or subtract a specific number of days to find the resulting date. The result shows the full date, the day of the week, and whether the resulting date falls on a major U.S. holiday. Great for calculating deadlines, return dates, due dates, or any future or past date. You can also pair this with a countdown timer to track time remaining until that date arrives.
The following table lists all 10 US federal holidays used in the business-day calculation for 2026 and 2027. When the "Business days only" toggle is active, any date that falls on one of these holidays is excluded from the count.
| Holiday | 2026 | 2027 |
|---|---|---|
| New Year's Day | Jan 1 (Thu) | Jan 1 (Fri) |
| Martin Luther King Jr. Day | Jan 19 (Mon) | Jan 18 (Mon) |
| Presidents' Day | Feb 16 (Mon) | Feb 15 (Mon) |
| Memorial Day | May 25 (Mon) | May 31 (Mon) |
| Independence Day | Jul 4 (Sat) | Jul 4 (Sun) |
| Labor Day | Sep 7 (Mon) | Sep 6 (Mon) |
| Columbus Day | Oct 12 (Mon) | Oct 11 (Mon) |
| Veterans Day | Nov 11 (Wed) | Nov 11 (Thu) |
| Thanksgiving | Nov 26 (Thu) | Nov 25 (Thu) |
| Christmas Day | Dec 25 (Fri) | Dec 25 (Sat) |