Refactor `quoted_date`

Move microseconds formatting to `AbstractAdapter`.

activerecord/lib/active_record/connection_adapters/abstract_adapter.rb

@@ -263,6 +263,16 @@ def index_algorithms
 
       # QUOTING ==================================================
 
+      # Quote date/time values for use in SQL input. Includes microseconds
+      # if the value is a Time responding to usec.
+      def quoted_date(value) #:nodoc:
+        if value.acts_like?(:time) && value.respond_to?(:usec)
+          "#{super}.#{sprintf("%06d", value.usec)}"
+        else
+          super
+        end
+      end
+
       # Returns a bind substitution value given a bind +column+
       # NOTE: The column param is currently being used by the sqlserver-adapter
       def substitute_at(column, _unused = 0)

activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb

@@ -74,14 +74,6 @@ def quote_string(string)
         @connection.escape(string)
       end
 
-      def quoted_date(value)
-        if value.acts_like?(:time) && value.respond_to?(:usec)
-          "#{super}.#{sprintf("%06d", value.usec)}"
-        else
-          super
-        end
-      end
-
       #--
       # CONNECTION MANAGEMENT ====================================
       #++

activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb

@@ -43,16 +43,12 @@ def quote_column_name(name) #:nodoc:
         # Quote date/time values for use in SQL input. Includes microseconds
         # if the value is a Time responding to usec.
         def quoted_date(value) #:nodoc:
-          result = super
-          if value.acts_like?(:time) && value.respond_to?(:usec)
-            result = "#{result}.#{sprintf("%06d", value.usec)}"
-          end
-
           if value.year <= 0
             bce_year = format("%04d", -value.year + 1)
-            result = result.sub(/^-?\d+/, bce_year) + " BC"
+            super.sub(/^-?\d+/, bce_year) + " BC"
+          else
+            super
           end
-          result
         end
 
         # Does not quote function default values for UUID columns

activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb

@@ -256,16 +256,6 @@ def quote_column_name(name) #:nodoc:
         %Q("#{name.to_s.gsub('"', '""')}")
       end
 
-      # Quote date/time values for use in SQL input. Includes microseconds
-      # if the value is a Time responding to usec.
-      def quoted_date(value) #:nodoc:
-        if value.respond_to?(:usec)
-          "#{super}.#{sprintf("%06d", value.usec)}"
-        else
-          super
-        end
-      end
-
       #--
       # DATABASE STATEMENTS ======================================
       #++