date.rb

 require 'active_support'
 require 'active_support/core_ext'

# Wrong
# 2014-04-06 00:59:59 UTC
# should be 2014-04-05 23:59:59 UTC
puts 37.days.since(Time.utc(2014, 2, 27, 23, 59, 59).in_time_zone('Wellington')).utc

# 2014-04-05 23:59:59 UTC
puts 37.days.since(Time.utc(2014, 2, 27, 23, 59, 59).in_time_zone('Wellington').utc)

# 2014-04-04 23:59:59 UTC
puts 36.days.since(Time.utc(2014, 2, 27, 23, 59, 59).in_time_zone('Wellington')).utc

# 2014-04-04 23:59:59 UTC
puts 36.days.since(Time.utc(2014, 2, 27, 23, 59, 59).in_time_zone('Wellington').utc)