Birthday Calculator

birth_date.rb

puts "What year where you born? (Enter a 4 digit year, ie 1984)"
birth_year = gets.chomp

puts "What month where you born? (Enter the month number, ie June would be 6)"
birth_month = gets.chomp

puts "What day of the month where you born?"
birth_day = gets.chomp

birth_date = Time.new(birth_year, birth_month, birth_day)

# Calculate the time difference between now and the birth date.  This gives us the difference in SECONDS.
seconds_diff = Time.now - birth_date

# Let's figure out how many seconds are in a minute, hour, day, and year.
minute_seconds = 60
hour_seconds = 60 * minute_seconds # 60 minutes in an hour
day_seconds = 24 * hour_seconds # 24 hours in a day
year_seconds = 365 * day_seconds # 365 days in a year (don't worry about leap year.)

# Now, divide our age in seconds by each unit to figure out how old we are in those units.
years_old = seconds_diff / year_seconds
days_old = seconds_diff / day_seconds
hours_old = seconds_diff / hour_seconds
minutes_old = seconds_diff / minute_seconds

puts "Your age in: "
puts "    Years: #{years_old.round(1)}"
puts "     Days: #{days_old.round(1)}"
puts "    Hours: #{hours_old.round(1)}"
puts "  Minutes: #{minutes_old.round(1)}"


# Let's figure out how old we are right now.
age_years = years_old

# Divide our age in years by 365 to get days.  The remainder is how many days it's been since our last birthday.
age_days = days_old % 365
age_hours  =  hours_old % 24
age_minutes = minutes_old % 60
age_seconds = seconds_diff % 60

# To drop the decimal numbers, just convert the number to an integer using .to_i
exact_age_sentence = "You are #{age_years.to_i} years, #{age_days.to_i} days"
exact_age_sentence = "#{exact_age_sentence}, #{age_hours.to_i} hours, #{age_minutes.to_i} minutes"
exact_age_sentence = "#{exact_age_sentence}, #{age_seconds.to_i} seconds old."

puts "\n#{exact_age_sentence}"