From 17f6d19b9c178b2d54abcea67c5eba22b619588f Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Fri, 31 May 2019 20:38:28 +0200
Subject: [PATCH] Add `Cask#install_time` method.

---
 Library/Homebrew/cask/cask.rb     | 7 +++++++
 Library/Homebrew/cask/metadata.rb | 8 ++------
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/Library/Homebrew/cask/cask.rb b/Library/Homebrew/cask/cask.rb
index 23d20dcc7889f..aef26e8b6f39f 100644
--- a/Library/Homebrew/cask/cask.rb
+++ b/Library/Homebrew/cask/cask.rb
@@ -80,6 +80,13 @@ def installed?
       !versions.empty?
     end
 
+    def install_time
+      _, time = timestamped_versions.last
+      return unless time
+
+      Time.strptime(time, Metadata::TIMESTAMP_FORMAT)
+    end
+
     def installed_caskfile
       installed_version = timestamped_versions.last
       metadata_master_container_path.join(*installed_version, "Casks", "#{token}.rb")
diff --git a/Library/Homebrew/cask/metadata.rb b/Library/Homebrew/cask/metadata.rb
index 9a47567e9f570..b15fbdda394aa 100644
--- a/Library/Homebrew/cask/metadata.rb
+++ b/Library/Homebrew/cask/metadata.rb
@@ -3,6 +3,7 @@
 module Cask
   module Metadata
     METADATA_SUBDIR = ".metadata"
+    TIMESTAMP_FORMAT = "%Y%m%d%H%M%S.%L"
 
     def metadata_master_container_path
       @metadata_master_container_path ||= caskroom_path.join(METADATA_SUBDIR)
@@ -58,12 +59,7 @@ def metadata_subdir(leaf, version: self.version, timestamp: :latest, create: fal
     private
 
     def new_timestamp(time = Time.now)
-      time = time.utc
-
-      timestamp = time.strftime("%Y%m%d%H%M%S")
-      fraction = format("%.3f", time.to_f - time.to_i)[1..-1]
-
-      timestamp.concat(fraction)
+      time.utc.strftime(TIMESTAMP_FORMAT)
     end
   end
 end