Business Days
Calculate working days, exclude weekends, and optionally exclude holidays using numpy.busday or pandas.
Python
Intermediate
4 min read
Business Day Calculations
Example
import numpy as np
from datetime import date, timedelta
start = np.datetime64("2024-06-10")
end = np.datetime64("2024-06-21")
bdays = np.busday_count(start, end) # working days between
in_5 = np.busday_offset(start, 5) # 5 business days from start
# Pure Python approach (weekdays only)
def add_business_days(dt, n):
while n > 0:
dt += timedelta(1)
if dt.weekday() < 5: n -= 1
return dt Pro Tip
For production finance/HR apps, use a holiday calendar — numpy.busdaycalendar accepts holiday arrays.