Days Between Dates Calculator: US Business Days
start date ↔ end dateCalculate days between two dates: total days, business days, weeks between dates, and weekend days. Exclude weekends and US federal holidays for accurate HR payroll and project tracking.
US Exclusive Use Cases
This days-between calculator is built for American workplace, HR, and tax scenarios where exact day counting matters:
- Days between two dates calculator: Find the exact number of days between any two US dates for contracts, payroll, and deadlines
- Business days calculator between dates: Count working days only, excluding weekends and federal holidays
- Exclude weekends from date count: Automatically remove Saturdays and Sundays from your day count
- How many weeks between two dates: Calculate weeks between dates for project timelines and sprint planning
- Employee leave accounting: Tallying PTO, FMLA, and unpaid leave duration for US HR records
- Project timeline days calculator: Count days for project planning and milestone tracking
US vs Global Calculation Differences
Day-span counting differs between the US and other regions in ways that affect payroll and contracts:
- Weekend model: US enterprises treat Saturday-Sunday as non-working weekends; some countries use single-day or rotating rest days
- Federal holiday stripping: US calculators can strip all 11 federal holidays from a span
- Midnight boundary: US date spans roll over at calendar midnight with no intra-day ambiguity
- Observance shifting: When a US holiday lands on a weekend, the observed weekday shifts
Common Calculation Mistakes
Common mistakes: confusing calendar days with payable workdays, forgetting that a holiday falling on a weekend still removes an observed weekday from the span, manually tallying a span and skipping a statutory holiday, and mixing paid days with raw calendar days for hourly US workers. Always decide up-front whether you need calendar days or business days before reading the result.
Tool Algorithm & Precision Explanation
The calculator runs multiple counting modes for different US use cases:
- Calendar days: raw inclusive count of every day from start to end, leap-year aware
- Business days: Monday-Friday only, excluding weekends and federal holidays
- Weeks between dates: exact week count for project sprint planning
- Years/months breakdown: additional context for long-term planning
- No rounding: results are exact integer counts with no approximation
US Federal Holiday & Workday Reference
Reference table of the 11 US federal holidays that this calculator can strip from a span:
| Holiday | Date Rule | Observance |
|---|---|---|
| New Year's Day | January 1 | Fri if Sat, Mon if Sun |
| MLK Jr. Day | 3rd Monday in January | Always Monday |
| Presidents' Day | 3rd Monday in February | Always Monday |
| Memorial Day | Last Monday in May | Always Monday |
| Juneteenth | June 19 | Fri if Sat, Mon if Sun |
| Independence Day | July 4 | Fri if Sat, Mon if Sun |
| Labor Day | 1st Monday in September | Always Monday |
| Columbus Day | 2nd Monday in October | Always Monday |
| Veterans Day | November 11 | Fri if Sat, Mon if Sun |
| Thanksgiving | 4th Thursday in November | Always Thursday |
| Christmas Day | December 25 | Fri if Sat, Mon if Sun |
HR Payroll Mode — US Salary Settlement Rules
HR Payroll Mode counts only payable workdays following US enterprise payroll standards — the gap generic AI tools leave open:
- Paid workday rule: counts Monday-Friday minus observed federal holidays — the days a US hourly or non-exempt employee is actually paid for
- Non-paid rest days: weekends and holidays are separated out so they never inflate a pay-period tally
- Monthly cycle case: a semimonthly US pay period Jan 1-15 yields payable workdays only, excluding New Year's Day and any weekend
- HR common mistake: mixing calendar days into a payroll count overstates payable days and triggers off-by-one pay errors
- Biweekly vs semimonthly: the engine walks actual calendar days, so it serves both US pay cycles without fixed 14-day assumptions
PTO Vacation Mode — US Paid Leave Accrual Rules
PTO Vacation Mode follows US paid-time-off accounting, separating charged PTO days from free rest days that overlap a leave span:
- Charged PTO days: only business days (Mon-Fri minus federal holidays) inside the leave span consume an employee's PTO balance
- Overlapping weekends: Saturdays and Sundays inside the span are free — they do not deduct from PTO
- Overlapping holidays: a federal holiday inside the span is paid by the employer, not charged to PTO
- Overlap deduction rule: a vacation spanning a holiday weekend charges fewer PTO days than its calendar length suggests
- Enterprise norm: US HR systems prorate PTO this way; charging raw calendar days is a common payroll error
Frequently Asked Questions
How do I calculate days between two dates in the US?
Enter your start date and end date, then click Calculate. The tool shows total days, business days, weeks, months, and years between the two dates.
Can I exclude weekends from my date count?
Yes, check the "Business Days Only" option to automatically exclude Saturdays and Sundays from your day count.
How many weeks are between two dates?
The calculator shows weeks between dates by dividing the total day count by 7, giving you the exact number of weeks for project planning.
How do I calculate business days excluding US federal holidays?
Use the Business Days Only option which automatically excludes weekends and all 11 US federal holidays from your count.
If a federal holiday falls on a weekend, does it still reduce my counted days?
Yes. US holidays observed on a shifted weekday (Friday or Monday) are removed from the business-day count.
Is the start date included in the day count?
Yes, this calculator counts inclusively from the start date through the end date, matching standard US HR convention.
How are leap years handled in the span?
February 29 is included automatically in calendar-day counts for leap years.