Free online date calculator with multiple modes: calculate date differences, age, business days (excluding 11 US federal holidays), add/subtract days, and find day of week. Instant results with keyboard shortcuts.
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Calculate date differences, age, business days, and more with our comprehensive date calculator. Features include days between dates, add days to date, business days calculator, and day of week finder.
Common date calculations people use every day
January 1, 2024 to December 31, 2024
From your birth date to today
Excluding weekends and holidays
Add 90 days to today's date
Count down to your special date
What day was July 4, 1776?
Professional date calculator with instant results for date differences, age calculations, business days, and date arithmetic. Perfect for project planning, scheduling, and personal use.
Get the most out of each calculator mode
Three simple steps to calculate days between dates
Select or type your starting date. Our calculator supports multiple date formats and makes it easy to pick dates with the calendar picker.
Choose your end date or target date. The calculator will automatically update to show the difference in real-time as you select.
View exact days, weeks, months between dates. Switch between different calculation modes for business days, age, or date arithmetic.
Common questions about calculating days between dates and using our calculator
Simply enter your start date and end date in the calculator above. The tool automatically calculates the exact number of days, weeks, and months between the two dates. It accounts for different month lengths and leap years automatically. For example, from January 1, 2024 to December 31, 2024 is exactly 365 days.
Yes! Our date calculator automatically accounts for leap years (like 2024, 2028) which have 366 days instead of 365. When calculating date differences that span a leap year, the extra day in February is included in the total. This ensures your calculations are always accurate.
Absolutely! Enter your birth date as the start date and today's date (or any future date) as the end date. The calculator shows your age in years, months, and days. It's perfect for age verification, tracking baby milestones, or calculating age for legal documents.
Switch to "Business Days" mode to calculate working days only, automatically excluding Saturdays and Sundays. This is perfect for project management, shipping estimates, and calculating work periods. You can also customize to exclude holidays for even more accurate business day calculations.
Yes! Use the "Add/Subtract Days" mode to add any number of days to a starting date. For example, add 90 days to today to find a date 3 months in the future, or subtract 30 days to find a date one month in the past. Perfect for deadline calculations and planning.
When you enable "Exclude Holidays" in Advanced Settings, all 11 US federal holidays are excluded: New Year's Day, MLK Day, Presidents' Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, and Christmas Day. Holidays with dynamic dates (like Thanksgiving) are calculated accurately for each year.
The calculator uses your browser's native date picker for easy date selection. You can choose from YYYY-MM-DD, MM/DD/YYYY, DD/MM/YYYY, and DD-MM-YYYY display formats in the Advanced Settings panel. Your preferred format is saved automatically for future visits.
Yes, completely free! No registration, no downloads, no hidden costs. Calculate as many date differences as you need. The calculator works entirely in your browser for fast performance and privacy - your dates are never stored or transmitted to our servers.
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