diff --git a/src/components/forms/DatePicker/DatePicker.tsx b/src/components/forms/DatePicker/DatePicker.tsx
index f2eeff1bbf..a5f563254d 100644
--- a/src/components/forms/DatePicker/DatePicker.tsx
+++ b/src/components/forms/DatePicker/DatePicker.tsx
@@ -97,7 +97,12 @@ export const DatePicker = ({
   const parsedRangeDate = rangeDate ? parseDateString(rangeDate) : undefined
 
   const validateInput = (): void => {
-    const isInvalid = isDateInvalid(externalValue, parsedMinDate, parsedMaxDate)
+    const isInvalid = isDateInvalid(
+      externalValue,
+      dateFormat,
+      parsedMinDate,
+      parsedMaxDate
+    )
 
     if (isInvalid && !externalInputEl?.current?.validationMessage) {
       externalInputEl?.current?.setCustomValidity(VALIDATION_MESSAGE)
@@ -134,7 +139,10 @@ export const DatePicker = ({
 
     const inputDate = parseDateString(value, dateFormat, true)
     let newValue = ''
-    if (inputDate && !isDateInvalid(value, parsedMinDate, parsedMaxDate)) {
+    if (
+      inputDate &&
+      !isDateInvalid(value, dateFormat, parsedMinDate, parsedMaxDate)
+    ) {
       newValue = formatDate(inputDate)
     }
 
diff --git a/src/components/forms/DatePicker/utils.test.ts b/src/components/forms/DatePicker/utils.test.ts
index 8b7ee8eefc..7734ec38c4 100644
--- a/src/components/forms/DatePicker/utils.test.ts
+++ b/src/components/forms/DatePicker/utils.test.ts
@@ -84,32 +84,64 @@ describe('isDateInvalid', () => {
   it('returns false if the date is within the min & max', () => {
     const testMin = new Date('May 1, 1988')
     const testMax = new Date('June 1, 1988')
-    expect(isDateInvalid('05/16/1988', testMin, testMax)).toEqual(false)
+    expect(
+      isDateInvalid(
+        '05/16/1988',
+        DEFAULT_EXTERNAL_DATE_FORMAT,
+        testMin,
+        testMax
+      )
+    ).toEqual(false)
   })
 
   it('returns true if the date is not within the min & max', () => {
     const testMin = new Date('May 1, 1988')
     const testMax = new Date('June 1, 1988')
-    expect(isDateInvalid('08/16/1988', testMin, testMax)).toEqual(true)
+    expect(
+      isDateInvalid(
+        '08/16/1988',
+        DEFAULT_EXTERNAL_DATE_FORMAT,
+        testMin,
+        testMax
+      )
+    ).toEqual(true)
   })
 
   it('returns true if the date is not valid', () => {
     const testMin = new Date('May 1, 1988')
     const testMax = new Date('June 1, 1988')
-    expect(isDateInvalid('not a date', testMin, testMax)).toEqual(true)
+    expect(
+      isDateInvalid(
+        'not a date',
+        DEFAULT_EXTERNAL_DATE_FORMAT,
+        testMin,
+        testMax
+      )
+    ).toEqual(true)
   })
 
   describe('with no max date', () => {
     it('returns false if the date is after the min', () => {
       const testMin = new Date('May 1, 1988')
-      expect(isDateInvalid('05/16/1988', testMin)).toEqual(false)
+      expect(
+        isDateInvalid('05/16/1988', DEFAULT_EXTERNAL_DATE_FORMAT, testMin)
+      ).toEqual(false)
     })
 
     it('returns true if the date is not after the min', () => {
       const testMin = new Date('May 1, 1988')
-      expect(isDateInvalid('02/16/1988', testMin)).toEqual(true)
+      expect(
+        isDateInvalid('02/16/1988', DEFAULT_EXTERNAL_DATE_FORMAT, testMin)
+      ).toEqual(true)
     })
   })
+
+  describe('with YYYY-MM-DD date format', () => {
+    const testMin = new Date('May 1, 1988')
+    expect(isDateInvalid('1988-16-02', INTERNAL_DATE_FORMAT, testMin)).toEqual(
+      true
+    )
+  })
 })
 
 describe('isDateWithinMinAndMax', () => {
diff --git a/src/components/forms/DatePicker/utils.tsx b/src/components/forms/DatePicker/utils.tsx
index a4629ef310..f090df1be8 100644
--- a/src/components/forms/DatePicker/utils.tsx
+++ b/src/components/forms/DatePicker/utils.tsx
@@ -460,6 +460,7 @@ export const formatDate = (
 
 export const isDateInvalid = (
   dateString: string,
+  dateFormat: DateFormat,
   minDate: Date,
   maxDate?: Date
 ): boolean => {
@@ -468,14 +469,23 @@ export const isDateInvalid = (
   if (dateString) {
     isInvalid = true
 
-    const dateStringParts = dateString.split('/')
-    const [month, day, year] = dateStringParts.map((str) => {
+    const dateStringParts = dateString.split(
+      dateFormat === DEFAULT_EXTERNAL_DATE_FORMAT ? '/' : '-'
+    )
+    const dateParts = dateStringParts.map((str) => {
       let value
       const parsed = parseInt(str, 10)
       if (!Number.isNaN(parsed)) value = parsed
       return value
     })
 
+    let month, day, year
+    if (dateFormat === DEFAULT_EXTERNAL_DATE_FORMAT) {
+      ;[month, day, year] = dateParts
+    } else {
+      ;[year, month, day] = dateParts
+    }
+
     if (month && day && year != null) {
       const checkDate = setDate(year, month - 1, day)