ice_cube_test.rb

#!/usr/bin/env ruby
require 'active_support/time'
require 'ice_cube'

#monthly on the 1st
rule = IceCube::Rule.monthly.day_of_month(1)

#UTC
utc_start = Time.new(2002, 10, 1, 4, 55, 0, "+00:00")
s_UTC = IceCube::Schedule.new(utc_start)
s_UTC.add_recurrence_rule(rule)

puts "UTC start: #{utc_start}, next_occurrence: #{s_UTC.next_occurrence(utc_start)}"

#GMT
gmt_start = Time.new(2002, 9, 30, 23, 55, 0, "-05:00")
s_GMT = IceCube::Schedule.new(gmt_start)
s_GMT.add_recurrence_rule(rule)

puts "GMT start: #{gmt_start}, next_occurrence: #{s_GMT.next_occurrence(gmt_start)}"

puts "GMT in UTC : #{gmt_start}.utc => #{gmt_start.utc}"
puts "UTC in GMT: #{utc_start}.in_time_zone() => #{utc_start.in_time_zone('EST')}"