entries.rb

#!/usr/bin/env ruby

require "csv"

time = 0

CSV.foreach(ARGV.first, headers: true) do |row|
  puts "#{row["Start date"]} #{row["Duration"]} #{row["Description"]}"
  hours, minutes, seconds = row["Duration"].split(":").map(&:to_i)
  time += hours * 3600 + minutes * 60 + seconds
end

hours = time / 3600
minutes = (time % 3600) / 60
seconds = (time % 3600) % 60

puts "           %02d:%02d:%02d total time" % [hours, minutes, seconds]