undefined method `iso8601' for 2016-03-01 18:51:48 UTC:Time

[osheroff]

getting this while running pumactl stats

/data/zendesk_occam/current/vendor/bundle/ruby/2.3.0/gems/puma-3.0.2/lib/puma/cluster.rb:309:in `block in stats'
/data/zendesk_occam/current/vendor/bundle/ruby/2.3.0/gems/puma-3.0.2/lib/puma/cluster.rb:309:in `map'
/data/zendesk_occam/current/vendor/bundle/ruby/2.3.0/gems/puma-3.0.2/lib/puma/cluster.rb:309:in `stats'
/data/zendesk_occam/current/vendor/bundle/ruby/2.3.0/gems/puma-3.0.2/lib/puma/launcher.rb:100:in `stats'
/data/zendesk_occam/current/vendor/bundle/ruby/2.3.0/gems/puma-3.0.2/lib/puma/app/status.rb:59:in `call'
/data/zendesk_occam/current/vendor/bundle/ruby/2.3.0/gems/puma-3.0.2/lib/puma/server.rb:561:in `handle_request'
/data/zendesk_occam/current/vendor/bundle/ruby/2.3.0/gems/puma-3.0.2/lib/puma/server.rb:406:in `process_client'
/data/zendesk_occam/current/vendor/bundle/ruby/2.3.0/gems/puma-3.0.2/lib/puma/server.rb:271:in `block in run'
/data/zendesk_occam/current/vendor/bundle/ruby/2.3.0/gems/puma-3.0.2/lib/puma/thread_pool.rb:111:in `block in spawn_thread'

errors disappear if I do require 'time' within config/puma.rb, which looks like:

port = ENV["OCCAM_PORT"] || 3210
workers = ENV["OCCAM_WORKERS"] || 20
quiet
threads 1,10
workers workers
queue_requests false
activate_control_app 'unix:///tmp/occam_puma_ctl.socket', { no_token: true, umask: 0077 }

prune_bundler

on_worker_boot do
  require 'bundler/setup'
end

bind "tcp://0.0.0.0:4080?backlog=1024"
directory "/data/zendesk_occam/current"