Merge pull request #441 from koic/make_rails_time_zone_aware_of_timez…

…one_specifier

[Fix #440] Make `Rails/TimeZone` aware of timezone specifier

CHANGELOG.md

@@ -13,6 +13,7 @@
 * [#409](https://github.com/rubocop-hq/rubocop-rails/pull/409): Deconstruct "table.column" in `Rails/WhereNot`. ([@mobilutz][])
 * [#416](https://github.com/rubocop-hq/rubocop-rails/pull/416): Make `Rails/HasManyOrHasOneDependent` accept combination of association extension and `with_options`. ([@ohbarye][])
 * [#432](https://github.com/rubocop-hq/rubocop-rails/issues/432): Exclude gemspec file by default for `Rails/TimeZone` cop. ([@koic][])
+* [#440](https://github.com/rubocop-hq/rubocop-rails/issues/440): This PR makes `Rails/TimeZone` aware of timezone specifier. ([@koic][])
 
 ## 2.9.1 (2020-12-16)
 

docs/modules/ROOT/pages/cops_rails.adoc

@@ -4157,15 +4157,16 @@ to use Time.in_time_zone.
 
 # bad
 Time.now
-Time.parse('2015-03-02 19:05:37')
+Time.parse('2015-03-02T19:05:37')
 
 # bad
 Time.current
 Time.at(timestamp).in_time_zone
 
 # good
 Time.zone.now
-Time.zone.parse('2015-03-02 19:05:37')
+Time.zone.parse('2015-03-02T19:05:37')
+Time.zone.parse('2015-03-02T19:05:37Z') # Respect ISO 8601 format with timezone specifier.
 ----
 
 ==== EnforcedStyle: flexible (default)
@@ -4176,11 +4177,11 @@ Time.zone.parse('2015-03-02 19:05:37')
 
 # bad
 Time.now
-Time.parse('2015-03-02 19:05:37')
+Time.parse('2015-03-02T19:05:37')
 
 # good
 Time.zone.now
-Time.zone.parse('2015-03-02 19:05:37')
+Time.zone.parse('2015-03-02T19:05:37')
 
 # good
 Time.current

lib/rubocop/cop/rails/time_zone.rb

@@ -19,26 +19,27 @@ module Rails
       #
       #   # bad
       #   Time.now
-      #   Time.parse('2015-03-02 19:05:37')
+      #   Time.parse('2015-03-02T19:05:37')
       #
       #   # bad
       #   Time.current
       #   Time.at(timestamp).in_time_zone
       #
       #   # good
       #   Time.zone.now
-      #   Time.zone.parse('2015-03-02 19:05:37')
+      #   Time.zone.parse('2015-03-02T19:05:37')
+      #   Time.zone.parse('2015-03-02T19:05:37Z') # Respect ISO 8601 format with timezone specifier.
       #
       # @example EnforcedStyle: flexible (default)
       #   # `flexible` allows usage of `in_time_zone` instead of `zone`.
       #
       #   # bad
       #   Time.now
-      #   Time.parse('2015-03-02 19:05:37')
+      #   Time.parse('2015-03-02T19:05:37')
       #
       #   # good
       #   Time.zone.now
-      #   Time.zone.parse('2015-03-02 19:05:37')
+      #   Time.zone.parse('2015-03-02T19:05:37')
       #
       #   # good
       #   Time.current
@@ -63,6 +64,8 @@ class TimeZone < Base
         ACCEPTED_METHODS = %i[in_time_zone utc getlocal xmlschema iso8601
                               jisx0301 rfc3339 httpdate to_i to_f].freeze
 
+        TIMEZONE_SPECIFIER = /[A-z]/.freeze
+
         def on_const(node)
           mod, klass = *node
           # we should only check core classes
@@ -116,9 +119,10 @@ def remove_redundant_in_time_zone(corrector, node)
         end
 
         def check_time_node(klass, node)
+          return if attach_timezone_specifier?(node.first_argument)
+
           chain = extract_method_chain(node)
           return if not_danger_chain?(chain)
-
           return check_localtime(node) if need_check_localtime?(chain)
 
           method_name = (chain & DANGEROUS_METHODS).join('.')
@@ -132,6 +136,10 @@ def check_time_node(klass, node)
           end
         end
 
+        def attach_timezone_specifier?(date)
+          date.respond_to?(:value) && TIMEZONE_SPECIFIER.match?(date.value.to_s[-1])
+        end
+
         def build_message(klass, method_name, node)
           if flexible?
             format(

spec/rubocop/cop/rails/time_zone_spec.rb

@@ -126,6 +126,24 @@
       RUBY
     end
 
+    it 'does not register an offense when attaching timezone specifier `Z`' do
+      expect_no_offenses(<<~RUBY)
+        Time.parse("2012-03-02T16:05:37Z")
+      RUBY
+    end
+
+    it 'does not register an offense when attaching timezone specifier `z`' do
+      expect_no_offenses(<<~RUBY)
+        Time.parse("2012-03-02T16:05:37z")
+      RUBY
+    end
+
+    it 'does not register an offense when attaching timezone specifier `E`' do
+      expect_no_offenses(<<~RUBY)
+        Time.parse("2012-03-02T16:05:37E")
+      RUBY
+    end
+
     it 'registers an offense for Time.at' do
       expect_offense(<<~RUBY)
         Time.at(ts)