diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 0de9041e06..a265e3bfbb 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -2764,6 +2764,7 @@ class Formula
     # <pre>deprecate! date: "2020-08-27", because: "has been replaced by foo"</pre>
     def deprecate!(date: nil, because: nil)
       odeprecated "`deprecate!` without a reason", "`deprecate! because: \"reason\"`" if because.blank?
+      odeprecated "`deprecate!` without a date", "`deprecate! date: \"#{Date.today}\"`" if date.blank?
 
       return if date.present? && Date.parse(date) > Date.today
 
@@ -2790,6 +2791,7 @@ class Formula
     # <pre>disable! date: "2020-08-27", because: "has been replaced by foo"</pre>
     def disable!(date: nil, because: nil)
       odeprecated "`disable!` without a reason", "`disable! because: \"reason\"`" if because.blank?
+      odeprecated "`disable!` without a date", "`disable! date: \"#{Date.today}\"`" if date.blank?
 
       if date.present? && Date.parse(date) > Date.today
         @deprecation_reason = because if because.present?
diff --git a/Library/Homebrew/test/livecheck/livecheck_spec.rb b/Library/Homebrew/test/livecheck/livecheck_spec.rb
index f742c9843a..5873f7ae78 100644
--- a/Library/Homebrew/test/livecheck/livecheck_spec.rb
+++ b/Library/Homebrew/test/livecheck/livecheck_spec.rb
@@ -25,7 +25,7 @@ describe Homebrew::Livecheck do
       desc "Deprecated test formula"
       homepage "https://brew.sh"
       url "https://brew.sh/test-0.0.1.tgz"
-      deprecate! because: :unmaintained
+      deprecate! date: "2020-06-25", because: :unmaintained
     end
   end
 
@@ -34,7 +34,7 @@ describe Homebrew::Livecheck do
       desc "Disabled test formula"
       homepage "https://brew.sh"
       url "https://brew.sh/test-0.0.1.tgz"
-      disable! because: :unmaintained
+      disable! date: "2020-06-25", because: :unmaintained
     end
   end