Date & Time
Business Day Calculator
Calculate business days between two dates, or add/subtract business days to find a deadline.
Inputs
Results
Working Days
0 Days
Total Calendar Days
0 Days
Weekend Days Skipped
0 Days
How It Works
The business day calculator filters dates by week index values ($0 = \text{Sunday}, 6 = \text{Saturday}$).\n\nIn 'Count' mode, it iterates chronologically through the calendar range, checking every intermediate date. In 'Add/Subtract' mode, it steps forward or backward one calendar day at a time, incrementing the business day tally only when a weekday (Monday through Friday) is encountered.
Formula Used
Weekday Check = DayOfWeek index is not 0 (Sunday) or 6 (Saturday)
To calculate business days, we filter calendar days by their day of the week. Monday through Friday are counted, while weekends are excluded from the tally.
Worked Example
Here is a step-by-step example of how these values are calculated:
Mode
Count between
Start Date
Jan 1, 2026 (Thursday)
End Date
Jan 14, 2026 (Wednesday)
Result: Working Days: 10 Days. Total Calendar Days: 14 Days. Weekend Days Skipped: 4 Days.
Frequently Asked Questions
Are statutory national holidays excluded?
No. Because official statutory holidays vary by country, state, county, and industry, this offline tool counts raw weekdays (Monday to Friday) only. It does not account for municipal holidays.
Can I count backwards to find a past deadline?
Yes. In the Add/Subtract mode, entering a negative number will calculate backwards into past business days.