Date Calculator
Calculate days between two dates, count business days (Mon-Fri), or add/subtract...Calculate days between two dates, count business days (Mon-Fri), or add/subtract days from any date. Includes weekday vs weekend breakdown with visual...
Weekday vs Weekend Split
Apr 8, 2026 Details
How Days Are Counted
"Days between" counts from the day after the start date through the end date. So Jan 1 → Jan 1 = 0 days, and Jan 1 → Jan 2 = 1 day. Weekdays + Weekends always equals Total Days.
Calculator Features
Why Use Date Calculator?
3 Calculation Modes
Date difference, add/subtract days, or business days - all in one tool.
Visual Weekday Split
See weekdays vs weekends with a color-coded bar chart that always adds up correctly.
Business Days Mode
Calculate deadlines that skip Saturdays and Sundays automatically.
Date Details
See week number, day of year, quarter, and leap year status for any date.
Quick Presets
One-click buttons for common intervals: 7, 14, 30, 90, 365 days.
Swap Dates
Easily swap start and end dates with one click to reverse calculations.
Common Uses
Project Deadlines
Calculate delivery dates for contracts. Add 30 business days to find when a deliverable is due.
Travel Planning
Find out how many days until your trip, or count nights for hotel bookings.
Legal Timelines
Calculate filing deadlines, response periods, or notice requirements in business days.
Personal Milestones
Count days since anniversaries, until birthdays, or between special events.
How It Works
Pick a Mode
Choose Date Difference to find days between dates, Add/Subtract to find a future/past date, or Business Days to skip weekends.
Enter Your Dates
Use the date pickers or click 'Set to Today' for quick input. Use quick buttons for common intervals.
Read Your Results
See total days prominently, plus breakdowns in weeks, months, hours. For date difference, view the weekday vs weekend split.
Tips & Tricks
Quick Presets Save Time
Use the quick buttons (+7, +30, +90, etc.) instead of typing numbers. For business days, common intervals are 5, 10, 20 days.
Business Days ≠ Calendar Days
20 business days is about 4 calendar weeks (28 days). When planning project timelines, remember weekends add ~40% more calendar time.
Holidays Not Included
The business days calculator skips weekends but NOT holidays. For precise deadline calculations, manually subtract public holidays.