diff --git a/frontend/src/utils/__tests__/dateTimeUtils.test.js b/frontend/src/utils/__tests__/dateTimeUtils.test.js
index bfdc4fbd..5ab6ed48 100644
--- a/frontend/src/utils/__tests__/dateTimeUtils.test.js
+++ b/frontend/src/utils/__tests__/dateTimeUtils.test.js
@@ -62,6 +62,24 @@ describe('dateTimeUtils', () => {
       const result = dateTimeUtils.initializeTime(date);
       expect(result.format()).toBe(dayjs(date).format());
     });
+
+    it('should handle custom format and locale', () => {
+      const result = dateTimeUtils.initializeTime('15/01/2024', 'DD/MM/YYYY');
+      expect(result.isValid()).toBe(true);
+      expect(result.date()).toBe(15);
+      expect(result.month()).toBe(0); // January = 0
+      expect(result.year()).toBe(2024);
+    });
+
+    it('should handle strict parsing', () => {
+      // With strict=true, a date that doesn't match the format should be invalid
+      const invalid = dateTimeUtils.initializeTime('15-01-2024', 'YYYY-MM-DD', null, true);
+      expect(invalid.isValid()).toBe(false);
+
+      // With strict=true and a matching format, it should be valid
+      const valid = dateTimeUtils.initializeTime('2024-01-15', 'YYYY-MM-DD', null, true);
+      expect(valid.isValid()).toBe(true);
+    });
   });
 
   describe('startOfDay', () => {
@@ -433,7 +451,7 @@ describe('dateTimeUtils', () => {
     });
 
     it('should return original string for unparseable format', () => {
-      expect(dateTimeUtils.toTimeString('2:30 PM')).toBe('2:30 PM');
+      expect(dateTimeUtils.toTimeString('not-a-time')).toBe('not-a-time');
     });
 
     it('should return original string for invalid format', () => {
@@ -712,4 +730,61 @@ describe('dateTimeUtils', () => {
       });
     });
   });
+
+  describe('isValid', () => {
+    it('should return true for a valid date string', () => {
+      expect(dateTimeUtils.isValid('2024-01-15T10:00:00Z')).toBe(true);
+    });
+
+    it('should return false for an invalid date string', () => {
+      expect(dateTimeUtils.isValid('not-a-date')).toBe(false);
+    });
+
+    it('should return true for a Date object', () => {
+      expect(dateTimeUtils.isValid(new Date())).toBe(true);
+    });
+
+    it('should return false for an invalid Date object', () => {
+      expect(dateTimeUtils.isValid(new Date('invalid'))).toBe(false);
+    });
+  });
+
+  describe('toDate', () => {
+    it('should convert a date string to a Date object', () => {
+      const result = dateTimeUtils.toDate('2024-01-15T10:00:00Z');
+      expect(result).toBeInstanceOf(Date);
+    });
+
+    it('should convert a dayjs object to a Date object', () => {
+      const djs = dayjs('2024-01-15T10:00:00Z');
+      const result = dateTimeUtils.toDate(djs);
+      expect(result).toBeInstanceOf(Date);
+    });
+  });
+
+  describe('setMillisecond', () => {
+    it('should set the millisecond on a date', () => {
+      const date = dayjs.utc('2024-01-15T10:00:00.000Z');
+      const result = dateTimeUtils.setMillisecond(date, 500);
+      expect(result.millisecond()).toBe(500);
+    });
+
+    it('should return 0 milliseconds when set to 0', () => {
+      const date = dayjs.utc('2024-01-15T10:00:00.999Z');
+      const result = dateTimeUtils.setMillisecond(date, 0);
+      expect(result.millisecond()).toBe(0);
+    });
+  });
+
+  describe('getMillisecond', () => {
+    it('should return the millisecond from a date', () => {
+      const date = dayjs.utc('2024-01-15T14:00:00.123Z');
+      expect(dateTimeUtils.getMillisecond(date)).toBe(123);
+    });
+
+    it('should return 0 for a date with no milliseconds', () => {
+      const date = dayjs.utc('2024-01-15T14:00:00.000Z');
+      expect(dateTimeUtils.getMillisecond(date)).toBe(0);
+    });
+  });
 });
diff --git a/frontend/src/utils/dateTimeUtils.js b/frontend/src/utils/dateTimeUtils.js
index 3930188b..f973e0b0 100644
--- a/frontend/src/utils/dateTimeUtils.js
+++ b/frontend/src/utils/dateTimeUtils.js
@@ -4,6 +4,7 @@ import duration from 'dayjs/plugin/duration';
 import relativeTime from 'dayjs/plugin/relativeTime';
 import utc from 'dayjs/plugin/utc';
 import timezone from 'dayjs/plugin/timezone';
+import customParseFormat from 'dayjs/plugin/customParseFormat';
 import useSettingsStore from '../store/settings';
 import useLocalStorage from '../hooks/useLocalStorage';
 
@@ -11,12 +12,21 @@ dayjs.extend(duration);
 dayjs.extend(relativeTime);
 dayjs.extend(utc);
 dayjs.extend(timezone);
+dayjs.extend(customParseFormat);
 
 export const convertToMs = (dateTime) => dayjs(dateTime).valueOf();
 
 export const convertToSec = (dateTime) => dayjs(dateTime).unix();
 
-export const initializeTime = (dateTime) => dayjs(dateTime);
+export const initializeTime = (dateTime, format = null, locale = null, strict = false) => {
+  if (format && locale) {
+    return dayjs(dateTime, format, locale, strict);
+  } else if (format) {
+    return dayjs(dateTime, format, strict);
+  } else {
+    return dayjs(dateTime);
+  }
+}
 
 export const startOfDay = (dateTime) => dayjs(dateTime).startOf('day');
 
@@ -43,6 +53,10 @@ export const getNow = () => dayjs();
 export const toFriendlyDuration = (dateTime, unit) =>
   dayjs.duration(dateTime, unit).humanize();
 
+export const isValid = (dateTime) => dayjs(dateTime).isValid();
+
+export const toDate = (dateTime) => dayjs(dateTime).toDate();
+
 export const formatExactDuration = (seconds) => {
   if (seconds < 60) return `${seconds.toFixed(1)} seconds`;
   if (seconds < 3600) {
@@ -76,6 +90,8 @@ export const setMinute = (dateTime, value) => dayjs(dateTime).minute(value);
 
 export const setSecond = (dateTime, value) => dayjs(dateTime).second(value);
 
+export const setMillisecond = (dateTime, value) => dayjs(dateTime).millisecond(value);
+
 export const getMonth = (dateTime) => dayjs(dateTime).month();
 
 export const getYear = (dateTime) => dayjs(dateTime).year();
@@ -88,6 +104,8 @@ export const getMinute = (dateTime) => dayjs(dateTime).minute();
 
 export const getSecond = (dateTime) => dayjs(dateTime).second();
 
+export const getMillisecond = (dateTime) => dayjs(dateTime).millisecond();
+
 export const getNowMs = () => Date.now();
 
 export const roundToNearest = (dateTime, minutes) => {