Business Days Calculator
Count the number of working days between two dates, excluding weekends.
About this tool
A business days calculator counts the number of working days between two dates, excluding weekends and optionally holidays. It's essential for project managers, HR professionals, and business planners who need to accurately estimate timelines, deadlines, and resource allocation. Unlike a simple day counter, it reflects the actual days your team is working.
To use this tool, enter your start and end dates, and the calculator instantly shows how many business days fall between them. You can also add holidays to exclude them from the count, making the calculation precise for your specific calendar. This is particularly useful when planning deliverables, calculating turnaround times, or estimating SLA compliance.
Frequently Asked Questions
Code Implementation
from datetime import date, timedelta
def add_business_days(start: date, days: int, holidays: list[date] = None) -> date:
"""Add a given number of business days to a start date."""
holidays = set(holidays or [])
current = start
remaining = days
step = 1 if days >= 0 else -1
while remaining != 0:
current += timedelta(days=step)
if current.weekday() < 5 and current not in holidays: # Mon-Fri
remaining -= step
return current
def count_business_days(start: date, end: date, holidays: list[date] = None) -> int:
"""Count business days between two dates (exclusive of start)."""
holidays = set(holidays or [])
count = 0
current = start
while current < end:
current += timedelta(days=1)
if current.weekday() < 5 and current not in holidays:
count += 1
return count
# Example
start = date(2024, 1, 1)
result = add_business_days(start, 10)
print(f"10 business days after {start}: {result}")
biz_days = count_business_days(date(2024, 1, 1), date(2024, 1, 31))
print(f"Business days in January 2024: {biz_days}")Comments & Feedback
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