diff --git a/Library/Homebrew/cask/cask.rb b/Library/Homebrew/cask/cask.rb
index 6d71d30ddffcb..fadce179e3861 100644
--- a/Library/Homebrew/cask/cask.rb
+++ b/Library/Homebrew/cask/cask.rb
@@ -321,6 +321,7 @@ def to_h
         "appcast"              => appcast,
         "version"              => version,
         "installed"            => installed_version,
+        "installed_time"       => install_time&.to_i,
         "outdated"             => outdated?,
         "sha256"               => sha256,
         "artifacts"            => artifacts_list,
diff --git a/Library/Homebrew/test/support/fixtures/cask/everything.json b/Library/Homebrew/test/support/fixtures/cask/everything.json
index 32eae9e9bd051..b720fd44e756e 100644
--- a/Library/Homebrew/test/support/fixtures/cask/everything.json
+++ b/Library/Homebrew/test/support/fixtures/cask/everything.json
@@ -20,6 +20,7 @@
   "appcast": null,
   "version": "1.2.3",
   "installed": null,
+  "installed_time": null,
   "outdated": false,
   "sha256": "c64c05bdc0be845505d6e55e69e696a7f50d40846e76155f0c85d5ff5e7bbb84",
   "artifacts": [