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diff --git a/spec/frontend/lib/utils/datetime/date_format_utility_spec.js b/spec/frontend/lib/utils/datetime/date_format_utility_spec.js
new file mode 100644
index 00000000000..942ba56196e
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+++ b/spec/frontend/lib/utils/datetime/date_format_utility_spec.js
@@ -0,0 +1,120 @@
+import * as utils from '~/lib/utils/datetime/date_format_utility';
+
+describe('date_format_utility.js', () => {
+  describe('padWithZeros', () => {
+    it.each`
+      input    | output
+      ${0}     | ${'00'}
+      ${'1'}   | ${'01'}
+      ${'10'}  | ${'10'}
+      ${'100'} | ${'100'}
+      ${100}   | ${'100'}
+      ${'a'}   | ${'0a'}
+      ${'foo'} | ${'foo'}
+    `('properly pads $input to match $output', ({ input, output }) => {
+      expect(utils.padWithZeros(input)).toEqual([output]);
+    });
+
+    it('accepts multiple arguments', () => {
+      expect(utils.padWithZeros(1, '2', 3)).toEqual(['01', '02', '03']);
+    });
+
+    it('returns an empty array provided no argument', () => {
+      expect(utils.padWithZeros()).toEqual([]);
+    });
+  });
+
+  describe('stripTimezoneFromISODate', () => {
+    it.each`
+      input                          | expectedOutput
+      ${'2021-08-16T00:00:00Z'}      | ${'2021-08-16T00:00:00'}
+      ${'2021-08-16T10:30:00+02:00'} | ${'2021-08-16T10:30:00'}
+      ${'2021-08-16T10:30:00-05:30'} | ${'2021-08-16T10:30:00'}
+    `('returns $expectedOutput when given $input', ({ input, expectedOutput }) => {
+      expect(utils.stripTimezoneFromISODate(input)).toBe(expectedOutput);
+    });
+
+    it('returns null if date is invalid', () => {
+      expect(utils.stripTimezoneFromISODate('Invalid date')).toBe(null);
+    });
+  });
+
+  describe('dateToYearMonthDate', () => {
+    it.each`
+      date                      | expectedOutput
+      ${new Date('2021-08-05')} | ${{ year: '2021', month: '08', day: '05' }}
+      ${new Date('2021-12-24')} | ${{ year: '2021', month: '12', day: '24' }}
+    `('returns $expectedOutput provided $date', ({ date, expectedOutput }) => {
+      expect(utils.dateToYearMonthDate(date)).toEqual(expectedOutput);
+    });
+
+    it('throws provided an invalid date', () => {
+      expect(() => utils.dateToYearMonthDate('Invalid date')).toThrow(
+        'Argument should be a Date instance',
+      );
+    });
+  });
+
+  describe('timeToHoursMinutes', () => {
+    it.each`
+      time       | expectedOutput
+      ${'23:12'} | ${{ hours: '23', minutes: '12' }}
+      ${'23:12'} | ${{ hours: '23', minutes: '12' }}
+    `('returns $expectedOutput provided $time', ({ time, expectedOutput }) => {
+      expect(utils.timeToHoursMinutes(time)).toEqual(expectedOutput);
+    });
+
+    it('throws provided an invalid time', () => {
+      expect(() => utils.timeToHoursMinutes('Invalid time')).toThrow('Invalid time provided');
+    });
+  });
+
+  describe('dateAndTimeToISOString', () => {
+    it('computes the date properly', () => {
+      expect(utils.dateAndTimeToISOString(new Date('2021-08-16'), '10:00')).toBe(
+        '2021-08-16T10:00:00.000Z',
+      );
+    });
+
+    it('computes the date properly with an offset', () => {
+      expect(utils.dateAndTimeToISOString(new Date('2021-08-16'), '10:00', '-04:00')).toBe(
+        '2021-08-16T10:00:00.000-04:00',
+      );
+    });
+
+    it('throws if date in invalid', () => {
+      expect(() => utils.dateAndTimeToISOString('Invalid date', '10:00')).toThrow(
+        'Argument should be a Date instance',
+      );
+    });
+
+    it('throws if time in invalid', () => {
+      expect(() => utils.dateAndTimeToISOString(new Date('2021-08-16'), '')).toThrow(
+        'Invalid time provided',
+      );
+    });
+
+    it('throws if offset is invalid', () => {
+      expect(() =>
+        utils.dateAndTimeToISOString(new Date('2021-08-16'), '10:00', 'not an offset'),
+      ).toThrow('Could not initialize date');
+    });
+  });
+
+  describe('dateToTimeInputValue', () => {
+    it.each`
+      input                                        | expectedOutput
+      ${new Date('2021-08-16T10:00:00.000Z')}      | ${'10:00'}
+      ${new Date('2021-08-16T22:30:00.000Z')}      | ${'22:30'}
+      ${new Date('2021-08-16T22:30:00.000-03:00')} | ${'01:30'}
+    `('extracts $expectedOutput out of $input', ({ input, expectedOutput }) => {
+      expect(utils.dateToTimeInputValue(input)).toBe(expectedOutput);
+    });
+
+    it('throws if date is invalid', () => {
+      expect(() => utils.dateToTimeInputValue('Invalid date')).toThrow(
+        'Argument should be a Date instance',
+      );
+    });
+  });
+});