diff --git a/.changeset/pretty-fireants-taste.md b/.changeset/pretty-fireants-taste.md
new file mode 100644
index 0000000000..db18c73b2f
--- /dev/null
+++ b/.changeset/pretty-fireants-taste.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog': patch
+---
+
+Removed unused functions and the moment library. #4278
diff --git a/plugins/catalog/package.json b/plugins/catalog/package.json
index c806c58e67..2ca0b59539 100644
--- a/plugins/catalog/package.json
+++ b/plugins/catalog/package.json
@@ -42,7 +42,6 @@
     "@types/react": "^16.9",
     "classnames": "^2.2.6",
     "git-url-parse": "^11.4.4",
-    "moment": "^2.26.0",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-helmet": "6.1.0",
diff --git a/plugins/catalog/src/components/CatalogPage/utils/timeUtil.js b/plugins/catalog/src/components/CatalogPage/utils/timeUtil.js
index 327f4177a8..e464b1d8fb 100644
--- a/plugins/catalog/src/components/CatalogPage/utils/timeUtil.js
+++ b/plugins/catalog/src/components/CatalogPage/utils/timeUtil.js
@@ -14,36 +14,10 @@
  * limitations under the License.
  */
 
-import moment from 'moment';
 import goodMorning from './locales/goodMorning.locales.json';
 import goodAfternoon from './locales/goodAfternoon.locales.json';
 import goodEvening from './locales/goodEvening.locales.json';
 
-/**
- * Validates that a date is a valid ISO string.
- *
- * @param date A date string
- * @returns {bool} Whether the date is valid or not.
- */
-export function isValidDate(date) {
-  return moment(date).isValid();
-}
-
-/**
- * Validates that a date is a valid ISO string and a specific format.
- *
- * @param date A date string
- * @param format A format string or an array of format strings to validate against.
- * @returns {bool} Whether the date is valid or not according to the format.
- */
-export function isValidDateAndFormat(date, format) {
-  return moment(date, format, true).isValid();
-}
-
-export function relativeTime(timestamp) {
-  return moment(timestamp).fromNow();
-}
-
 // Select a large random integer at startup, to prevent the greetings to change every time the user
 // navigates.
 const greetingRandomSeed = Math.floor(Math.random() * 1000000);
diff --git a/plugins/catalog/src/components/CatalogPage/utils/timeUtil.test.js b/plugins/catalog/src/components/CatalogPage/utils/timeUtil.test.js
index d18b4a5b20..a95273325e 100644
--- a/plugins/catalog/src/components/CatalogPage/utils/timeUtil.test.js
+++ b/plugins/catalog/src/components/CatalogPage/utils/timeUtil.test.js
@@ -14,20 +14,7 @@
  * limitations under the License.
  */
 
-import { isValidDateAndFormat, getTimeBasedGreeting } from './timeUtil';
-
-it('validates time format', () => {
-  const valid = isValidDateAndFormat(
-    '1970-01-01T00:00:00',
-    'YYYY-MM-DD[T]HH:mm:ss',
-  );
-  const invalid = isValidDateAndFormat(
-    '1970/01/01T00:00:00',
-    'YYYY-MM-DD[T]HH:mm:ss',
-  );
-  expect(valid).toBe(true);
-  expect(invalid).toBe(false);
-});
+import { getTimeBasedGreeting } from './timeUtil';
 
 it('has greeting and language', () => {
   const greeting = getTimeBasedGreeting();