Days Between Dates | Business Days (Mon-Fri) | Add/Subtract Days
Days = End Date - Start Date
Total Days
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Business Days (Mon-Fri)
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New Date
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📖 Days Calculator - Days Between Dates, Business Days & Add/Subtract
A days calculator is an essential tool for anyone who needs to calculate time intervals between dates, count business days (Monday-Friday), or add/subtract days from a specific date. Whether you're planning a project, tracking a deadline, estimating shipping time, or counting down to an event, this tool provides accurate results instantly.
📐 How to Calculate Days Between Dates
Days = End Date - Start Date
To calculate the number of days between two dates manually:
Subtract the earlier date from the later date
Account for different month lengths (28-31 days)
Include leap years (February 29)
This calculator handles all complexities automatically
📊 Calendar Days vs Business Days
Type
Definition
Common Use
Calendar Days
All 7 days (Mon-Sun)
Warranty, age, event countdown
Business Days
Mon-Fri only
Shipping, project deadlines, work schedules
Weekend Days
Sat-Sun only
Rest days, leisure planning
💡 Common Use Cases
Project Planning: Calculate duration in days for realistic scheduling
Contract Deadlines: Determine if deadlines fall on weekdays or weekends
Event Planning: Count days until weddings, vacations, or special events
Shipping & Delivery: Estimate delivery times based on business days
Loan Processing: Calculate approval and funding timelines
Employment: Calculate work days for payroll or attendance tracking
❓ Frequently Asked Questions
What is the difference between calendar days and business days? ▼
Calendar days include every day of the week (including weekends). Business days count only Monday through Friday, excluding Saturdays and Sundays. Business days are commonly used for work-related deadlines and shipping estimates.
Are holidays excluded from business days? ▼
This calculator excludes only weekends (Saturdays and Sundays). For holidays, you would need to manually subtract them.
Does the calculator count the end date? ▼
Yes, the calculation includes both start and end dates when counting days. For example, from Monday to Tuesday is 2 days if you count both dates.
How do I calculate only weekdays (Monday-Friday)? ▼
Use the "Business Days" tab in our calculator. It automatically counts only Monday through Friday days between your selected dates.
Can I calculate what date is 90 days from today? ▼
Yes! Use the "Add/Subtract Days" tab. Enter today's date as the base date and add 90 days to see the future date and its weekday.
Does the calculator handle leap years correctly? ▼
Yes, the calculator automatically accounts for leap years (February 29) in all date calculations.