from datetime import date, timedelta
def add_weeks_to_date(base_date: date, weeks: int) -> date:
"""
Adds a specified number of weeks to a given date.
:param base_date: The original date (datetime.date instance).
:param weeks: The number of weeks to add (can also be negative to subtract).
:return: A new datetime.date instance with the added weeks.
"""
# datetime.timedelta natively supports weeks. Adding it to a date object
# automatically manages leap years, month-end boundaries, and year rollovers.
return base_date + timedelta(weeks=weeks)
if __name__ == "__main__":
# Initialize a sample date: November 8, 2026
target_date = date(2026, 11, 8)
weeks_to_add = 4
# Perform the addition
result_date = add_weeks_to_date(target_date, weeks_to_add)
# Display the formatted results using ISO format (YYYY-MM-DD)
print(f"Original date: {target_date.isoformat()}")
print(f"After adding {weeks_to_add} weeks: {result_date.isoformat()}")
'''
run:
Original date: 2026-11-08
After adding 4 weeks: 2026-12-06
'''
