diff --git a/CHANGELOG b/CHANGELOG
index e86eae093301060e8295b070ddb73f897ba9d4b3..9ce58719999ad01e0b47a1e3d6b080697d30032a 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -61,6 +61,7 @@ v 8.12.0 (unreleased)
   - Move to project dropdown with infinite scroll for better performance
   - Fix leaking of submit buttons outside the width of a main container !18731 (originally by @pavelloz)
   - Load branches asynchronously in Cherry Pick and Revert dialogs.
+  - Convert datetime coffeescript spec to ES6 (ClemMakesApps)
   - Add merge request versions !5467
   - Change using size to use count and caching it for number of group members. !5935
   - Replace play icon font with svg (ClemMakesApps)
diff --git a/spec/javascripts/datetime_utility_spec.js.coffee b/spec/javascripts/datetime_utility_spec.js.coffee
deleted file mode 100644
index 8bd113e7d860ff679d7deeaa6b4527779ab6e001..0000000000000000000000000000000000000000
--- a/spec/javascripts/datetime_utility_spec.js.coffee
+++ /dev/null
@@ -1,50 +0,0 @@
-#= require lib/utils/datetime_utility
-
-describe 'Date time utils', ->
-  describe 'get day name', ->
-    it 'should return Sunday', ->
-      day = gl.utils.getDayName(new Date('07/17/2016'))
-      expect(day).toBe('Sunday')
-
-    it 'should return Monday', ->
-      day = gl.utils.getDayName(new Date('07/18/2016'))
-      expect(day).toBe('Monday')
-
-    it 'should return Tuesday', ->
-      day = gl.utils.getDayName(new Date('07/19/2016'))
-      expect(day).toBe('Tuesday')
-
-    it 'should return Wednesday', ->
-      day = gl.utils.getDayName(new Date('07/20/2016'))
-      expect(day).toBe('Wednesday')
-
-    it 'should return Thursday', ->
-      day = gl.utils.getDayName(new Date('07/21/2016'))
-      expect(day).toBe('Thursday')
-
-    it 'should return Friday', ->
-      day = gl.utils.getDayName(new Date('07/22/2016'))
-      expect(day).toBe('Friday')
-
-    it 'should return Saturday', ->
-      day = gl.utils.getDayName(new Date('07/23/2016'))
-      expect(day).toBe('Saturday')
-
-  describe 'get day difference', ->
-    it 'should return 7', ->
-      firstDay = new Date('07/01/2016')
-      secondDay = new Date('07/08/2016')
-      difference = gl.utils.getDayDifference(firstDay, secondDay)
-      expect(difference).toBe(7)
-
-    it 'should return 31', ->
-      firstDay = new Date('07/01/2016')
-      secondDay = new Date('08/01/2016')
-      difference = gl.utils.getDayDifference(firstDay, secondDay)
-      expect(difference).toBe(31)
-
-    it 'should return 365', ->
-      firstDay = new Date('07/02/2015')
-      secondDay = new Date('07/01/2016')
-      difference = gl.utils.getDayDifference(firstDay, secondDay)
-      expect(difference).toBe(365)
\ No newline at end of file
diff --git a/spec/javascripts/datetime_utility_spec.js.es6 b/spec/javascripts/datetime_utility_spec.js.es6
new file mode 100644
index 0000000000000000000000000000000000000000..a2d1b0a7732861bc15c60b5feffd112c45f77699
--- /dev/null
+++ b/spec/javascripts/datetime_utility_spec.js.es6
@@ -0,0 +1,64 @@
+//= require lib/utils/datetime_utility
+(() => {
+  describe('Date time utils', () => {
+    describe('get day name', () => {
+      it('should return Sunday', () => {
+        const day = gl.utils.getDayName(new Date('07/17/2016'));
+        expect(day).toBe('Sunday');
+      });
+
+      it('should return Monday', () => {
+        const day = gl.utils.getDayName(new Date('07/18/2016'));
+        expect(day).toBe('Monday');
+      });
+
+      it('should return Tuesday', () => {
+        const day = gl.utils.getDayName(new Date('07/19/2016'));
+        expect(day).toBe('Tuesday');
+      });
+
+      it('should return Wednesday', () => {
+        const day = gl.utils.getDayName(new Date('07/20/2016'));
+        expect(day).toBe('Wednesday');
+      });
+
+      it('should return Thursday', () => {
+        const day = gl.utils.getDayName(new Date('07/21/2016'));
+        expect(day).toBe('Thursday');
+      });
+
+      it('should return Friday', () => {
+        const day = gl.utils.getDayName(new Date('07/22/2016'));
+        expect(day).toBe('Friday');
+      });
+
+      it('should return Saturday', () => {
+        const day = gl.utils.getDayName(new Date('07/23/2016'));
+        expect(day).toBe('Saturday');
+      });
+    });
+
+    describe('get day difference', () => {
+      it('should return 7', () => {
+        const firstDay = new Date('07/01/2016');
+        const secondDay = new Date('07/08/2016');
+        const difference = gl.utils.getDayDifference(firstDay, secondDay);
+        expect(difference).toBe(7);
+      });
+
+      it('should return 31', () => {
+        const firstDay = new Date('07/01/2016');
+        const secondDay = new Date('08/01/2016');
+        const difference = gl.utils.getDayDifference(firstDay, secondDay);
+        expect(difference).toBe(31);
+      });
+
+      it('should return 365', () => {
+        const firstDay = new Date('07/02/2015');
+        const secondDay = new Date('07/01/2016');
+        const difference = gl.utils.getDayDifference(firstDay, secondDay);
+        expect(difference).toBe(365);
+      });
+    });
+  });
+})();