require 'date'
# Adds a specified number of weeks to a given Date object.
#
# @param base_date [Date] The original Date instance.
# @param weeks [Integer] The number of weeks to add (can also be negative to subtract).
# @return [Date] A new Date instance with the added weeks.
def add_weeks_to_date(base_date, weeks)
unless base_date.is_a?(Date)
raise ArgumentError, "base_date must be an instance of Date"
end
# Standard Ruby Date objects support integer addition (representing days).
# We multiply weeks by 7 to convert them into days.
base_date + (weeks * 7)
end
if __FILE__ == $PROGRAM_NAME
# Initialize a sample date: November 8, 2026
target_date = Date.new(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 (Date defaults to ISO-8601 YYYY-MM-DD on string conversion)
puts "Original date: #{target_date}"
puts "After adding #{weeks_to_add} weeks: #{result_date}"
end
# run:
#
# Original date: 2026-11-08
# After adding 4 weeks: 2026-12-06
#
