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require 'date'
def remaining(date, event)
intervals = [["day", 1], ["hour", 24], ["minute", 60], ["second", 60]]
elapsed = DateTime.now - date
tense = elapsed > 0 ? "since" : "until"
interval = 1.0
parts = intervals.collect do |name, new_interval|
interval /= new_interval
number, elapsed = elapsed.abs.divmod(interval)
"#{number.to_i} #{name}#{"s" unless number == 1}"
end
puts "#{parts.join(", ")} #{tense} #{event}."
end
remaining(DateTime.new(2006, 4, 15, 0, 0, 0, DateTime.now.offset),"the book deadline")
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