diff --git a/Library/Homebrew/extend/os/mac/unpack_strategy/zip.rb b/Library/Homebrew/extend/os/mac/unpack_strategy/zip.rb
index b9c07431ce..65585d3cd0 100644
--- a/Library/Homebrew/extend/os/mac/unpack_strategy/zip.rb
+++ b/Library/Homebrew/extend/os/mac/unpack_strategy/zip.rb
@@ -15,47 +15,49 @@ module UnpackStrategy
 
       sig { override.params(unpack_dir: Pathname, basename: Pathname, verbose: T::Boolean).returns(T.untyped) }
       def extract_to_dir(unpack_dir, basename:, verbose:)
-        if merge_xattrs && contains_extended_attributes?(path)
-          # We use ditto directly, because dot_clean has issues if the __MACOSX
-          # folder has incorrect permissions.
-          # (Also, Homebrew's ZIP artifact automatically deletes this folder.)
-          return system_command! "ditto",
-                                 args:         ["-x", "-k", path, unpack_dir],
-                                 verbose:      verbose,
-                                 print_stderr: false
-        end
+        with_env(TZ: "UTC") do
+          if merge_xattrs && contains_extended_attributes?(path)
+            # We use ditto directly, because dot_clean has issues if the __MACOSX
+            # folder has incorrect permissions.
+            # (Also, Homebrew's ZIP artifact automatically deletes this folder.)
+            return system_command! "ditto",
+                                   args:         ["-x", "-k", path, unpack_dir],
+                                   verbose:      verbose,
+                                   print_stderr: false
+          end
 
-        result = begin
-          T.let(super, T.nilable(SystemCommand::Result))
-        rescue ErrorDuringExecution => e
-          raise unless e.stderr.include?("End-of-central-directory signature not found.")
+          result = begin
+            T.let(super, T.nilable(SystemCommand::Result))
+          rescue ErrorDuringExecution => e
+            raise unless e.stderr.include?("End-of-central-directory signature not found.")
 
-          system_command! "ditto",
-                          args:    ["-x", "-k", path, unpack_dir],
-                          verbose: verbose
-          nil
-        end
+            system_command! "ditto",
+                            args:    ["-x", "-k", path, unpack_dir],
+                            verbose: verbose
+            nil
+          end
 
-        return if result.blank?
+          return if result.blank?
 
-        volumes = result.stderr.chomp
-                        .split("\n")
-                        .map { |l| l[/\A   skipping: (.+)  volume label\Z/, 1] }
-                        .compact
+          volumes = result.stderr.chomp
+                          .split("\n")
+                          .map { |l| l[/\A   skipping: (.+)  volume label\Z/, 1] }
+                          .compact
 
-        return if volumes.empty?
+          return if volumes.empty?
 
-        Dir.mktmpdir do |tmp_unpack_dir|
-          tmp_unpack_dir = Pathname(tmp_unpack_dir)
+          Dir.mktmpdir do |tmp_unpack_dir|
+            tmp_unpack_dir = Pathname(tmp_unpack_dir)
 
-          # `ditto` keeps Finder attributes intact and does not skip volume labels
-          # like `unzip` does, which can prevent disk images from being unzipped.
-          system_command! "ditto",
-                          args:    ["-x", "-k", path, tmp_unpack_dir],
-                          verbose: verbose
+            # `ditto` keeps Finder attributes intact and does not skip volume labels
+            # like `unzip` does, which can prevent disk images from being unzipped.
+            system_command! "ditto",
+                            args:    ["-x", "-k", path, tmp_unpack_dir],
+                            verbose: verbose
 
-          volumes.each do |volume|
-            FileUtils.mv tmp_unpack_dir/volume, unpack_dir/volume, verbose: verbose
+            volumes.each do |volume|
+              FileUtils.mv tmp_unpack_dir/volume, unpack_dir/volume, verbose: verbose
+            end
           end
         end
       end
diff --git a/Library/Homebrew/unpack_strategy/zip.rb b/Library/Homebrew/unpack_strategy/zip.rb
index 488a4dfc45..9f2174d1be 100644
--- a/Library/Homebrew/unpack_strategy/zip.rb
+++ b/Library/Homebrew/unpack_strategy/zip.rb
@@ -27,15 +27,17 @@ module UnpackStrategy
               .returns(SystemCommand::Result)
     }
     def extract_to_dir(unpack_dir, basename:, verbose:)
-      quiet_flags = verbose ? [] : ["-qq"]
-      result = system_command! "unzip",
-                               args:         [*quiet_flags, "-o", path, "-d", unpack_dir],
-                               verbose:      verbose,
-                               print_stderr: false
+      with_env(TZ: "UTC") do
+        quiet_flags = verbose ? [] : ["-qq"]
+        result = system_command! "unzip",
+                                 args:         [*quiet_flags, "-o", path, "-d", unpack_dir],
+                                 verbose:      verbose,
+                                 print_stderr: false
 
-      FileUtils.rm_rf unpack_dir/"__MACOSX"
+        FileUtils.rm_rf unpack_dir/"__MACOSX"
 
-      result
+        result
+      end
     end
   end
 end