require 'active_support/core_ext'


# No Time.zone setting

Time.use_zone(nil) { Time.current }
# => 2019-11-29 07:38:04 +0900

Time.use_zone(nil) { Time.current.class }
# => Time



# with Time.zone setting
# Time.current class changed Time to ActiveSupport::TimeWithZone

Time.use_zone('UTC') { Time.current }
# => Thu, 28 Nov 2019 22:38:20 UTC +00:00

Time.use_zone('UTC') { Time.current.class }
# => ActiveSupport::TimeWithZone

Time.use_zone('UTC') { Time.zone.now }
# => Thu, 28 Nov 2019 22:38:26 UTC +00:00

Time.use_zone('UTC') { Time.zone.now.class }
# => ActiveSupport::TimeWithZone



require 'active_support/testing/time_helpers'
include ActiveSupport::Testing::TimeHelpers

# Freeze time
Time.use_zone('UTC') { travel_to Time.parse('2020-01-01 00:00') }

Time.use_zone('UTC') { Time.current == Time.zone.now }
# => true


# NOTE
# Time.parse class not changed to ActiveSupport::TimeWithZone

Time.parse('2020-01-01 00:00')
# => 2020-01-01 00:00:00 +0900

Time.parse('2020-01-01 00:00').class
# => Time

Time.use_zone('UTC') { Time.zone.parse('2020-01-01 00:00') }
# => Wed, 01 Jan 2020 00:00:00 UTC +00:00

Time.use_zone('UTC') { Time.zone.parse('2020-01-01 00:00').class }
# => ActiveSupport::TimeWithZone

Original by Github issue

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