That thing when you write a ruby script to calculate holiday days :-)

holidays.rb

require 'date'

DAY_NAMES = %w[Sun Mon Tue Wed Thu Fri Sat].freeze

BANK_HOLIDAYS = [
  Date.new(2017, 1, 2),
  Date.new(2017, 4, 14),
  Date.new(2017, 4, 17),
  Date.new(2017, 5, 1),
  Date.new(2017, 5, 29),
  Date.new(2017, 8, 28),
  Date.new(2017, 12, 25),
  Date.new(2017, 12, 26)
].freeze

working_days = 0
tapi_days = 0
days_to_oct = 0
days_after_oct = 0
no_thursdays = 0
tues_wed = 0

d = Date.new(2017, 1, 1)
while d < Date.new(2018, 1, 1)
  d += 1
  next if d.wday == 0 || d.wday == 6 || (BANK_HOLIDAYS.include? d)

  working_days += 1
  if d < Date.new(2017, 10, 1)
    unless d.wday == 4
      tapi_days += 1
      days_to_oct += 1
      puts "#{working_days} - #{DAY_NAMES[d.wday]} - #{d}"
    end
  else
    if d.wday == 2 || d.wday == 3
      tapi_days += 1
      days_after_oct += 1
      puts "#{working_days} - #{DAY_NAMES[d.wday]} - #{d}"
    end
  end

  no_thursdays += 1 unless d.wday == 4

  tues_wed += 1 if d.wday == 2 || d.wday == 3
end

puts "#{working_days} mon-fri working days"
puts "#{no_thursdays} no Thursdays"
puts "#{tues_wed} Tues & Wed"

puts "#{tapi_days} mon-wed+fri / tue-wed days"
puts "#{days_to_oct} mon-wed+fri days to oct"
puts "#{days_after_oct} tue-wed days days after oct"