diff --git a/README.md b/README.md
index 03f5351..6d76d8a 100644
--- a/README.md
+++ b/README.md
@@ -464,6 +464,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 3136. Valid Word                                                   | [Link](https://leetcode.com/problems/valid-word/)                                                   | [Link](./lib/easy/3136_valid_word.rb)                                                   | [Link](./test/easy/test_3136_valid_word.rb)                                                   |
 | 3151. Special Array I                                              | [Link](https://leetcode.com/problems/special-array-i/)                                              | [Link](./lib/easy/3151_special_array_i.rb)                                              | [Link](./test/easy/test_3151_special_array_i.rb)                                              |
 | 3210. Find the Encrypted String                                    | [Link](https://leetcode.com/problems/find-the-encrypted-string/)                                    | [Link](./lib/easy/3210_find_the_encrypted_string.rb)                                    | [Link](./test/easy/test_3210_find_the_encrypted_string.rb)                                    |
+| 3280. Convert Date to Binary                                       | [Link](https://leetcode.com/problems/convert-date-to-binary/)                                       | [Link](./lib/easy/3280_convert_date_to_binary.rb)                                       | [Link](./test/easy/test_3280_convert_date_to_binary.rb)                                       |
 | 3498. Reverse Degree of a String                                   | [Link](https://leetcode.com/problems/reverse-degree-of-a-string/)                                   | [Link](./lib/easy/3498_reverse_degree_of_a_string.rb)                                   | [Link](./test/easy/test_3498_reverse_degree_of_a_string.rb)                                   |
 
 ### Medium
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index c0e937b..ae2699e 100644
--- a/leetcode-ruby.gemspec
+++ b/leetcode-ruby.gemspec
@@ -5,7 +5,7 @@ require 'English'
 ::Gem::Specification.new do |s|
   s.required_ruby_version = '>= 3.0'
   s.name = 'leetcode-ruby'
-  s.version = '9.3.3'
+  s.version = '9.3.4'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'
diff --git a/lib/easy/3280_convert_date_to_binary.rb b/lib/easy/3280_convert_date_to_binary.rb
new file mode 100644
index 0000000..e8edb8c
--- /dev/null
+++ b/lib/easy/3280_convert_date_to_binary.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/convert-date-to-binary/
+# @param {String} date
+# @return {String}
+def convert_date_to_binary(date)
+  result = []
+
+  date.split('-').each do |line|
+    result << format('%b', line.to_i)
+  end
+
+  result.join('-')
+end
diff --git a/test/easy/test_3280_convert_date_to_binary.rb b/test/easy/test_3280_convert_date_to_binary.rb
new file mode 100644
index 0000000..fc976f4
--- /dev/null
+++ b/test/easy/test_3280_convert_date_to_binary.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/easy/3280_convert_date_to_binary'
+require 'minitest/autorun'
+
+class ConvertDateToBinaryTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      '100000100000-10-11101',
+      convert_date_to_binary(
+        '2080-02-29'
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      '11101101100-1-1',
+      convert_date_to_binary(
+        '1900-01-01'
+      )
+    )
+  end
+end