# REQUIRE : on Ruby

require 'active_support/testing/time_helpers'
# => true

require 'active_support/core_ext'
# => true

include ActiveSupport::Testing::TimeHelpers
# => Object


# Travel to JST beggining of Year

travel_to Time.use_zone('Tokyo') { Time.parse('2020-01-01 00:00') }
# => nil


# JST

Time.use_zone('Tokyo') { Time.current }
# => Wed, 01 Jan 2020 00:00:00 JST +09:00

Time.use_zone('Tokyo') { Time.zone.now }
# => Wed, 01 Jan 2020 00:00:00 JST +09:00

Time.use_zone('Tokyo') { Date.current }
# => Wed, 01 Jan 2020


# UTC


Time.use_zone('UTC') { Time.current }
# => Tue, 31 Dec 2019 15:00:00 UTC +00:00

Time.use_zone('UTC') { Time.zone.now }
# => Tue, 31 Dec 2019 15:00:00 UTC +00:00

Time.use_zone('UTC') { Date.current }
# => Tue, 31 Dec 2019


# Unix Timestamp
# are All same at any Timezone

Time.use_zone('Tokyo') { Time.zone.now.to_i }
# => 1577804400

Time.use_zone('UTC') { Time.zone.now.to_i }
# => 1577804400

Time.now.to_i
# => 1577804400

Time.current.to_i
# => 1577804400


# UTC vs JST near date change line

travel_to Time.use_zone('Tokyo') { Time.parse('2020-01-01 08:59') }

Time.use_zone('UTC') { Date.current }
# => Tue, 31 Dec 2019

travel_to Time.use_zone('Tokyo') { Time.parse('2020-01-01 09:00') }
# => nil

Time.use_zone('UTC') { Date.current }
# => Wed, 01 Jan 2020

Original by Github issue

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