diff --git a/schemas/registry-org/BaseOrg.json b/schemas/registry-org/BaseOrg.json
index 5ece322e3..718898f27 100644
--- a/schemas/registry-org/BaseOrg.json
+++ b/schemas/registry-org/BaseOrg.json
@@ -167,7 +167,7 @@
       "properties": {
         "cve_website_update_date": {
           "type": "string",
-          "format": "date-time"
+          "format": "date"
         },
         "cve_website_update_needed": {
           "type": "boolean"
diff --git a/schemas/registry-org/create-registry-org-request.json b/schemas/registry-org/create-registry-org-request.json
index de38a4d67..999a7d036 100644
--- a/schemas/registry-org/create-registry-org-request.json
+++ b/schemas/registry-org/create-registry-org-request.json
@@ -166,7 +166,7 @@
       "properties": {
         "cve_website_update_date": {
           "type": "string",
-          "format": "date-time"
+          "format": "date"
         },
         "cve_website_update_needed": {
           "type": "boolean"
diff --git a/schemas/registry-org/get-registry-org-response.json b/schemas/registry-org/get-registry-org-response.json
index 1d29a56bc..c8e967e1d 100644
--- a/schemas/registry-org/get-registry-org-response.json
+++ b/schemas/registry-org/get-registry-org-response.json
@@ -129,7 +129,7 @@
       "properties": {
         "cve_website_update_date": {
           "type": "string",
-          "format": "date-time"
+          "format": "date"
         },
         "cve_website_update_needed": {
           "type": "boolean"
diff --git a/schemas/registry-org/list-registry-orgs-response.json b/schemas/registry-org/list-registry-orgs-response.json
index 4bd62f90d..da403895a 100644
--- a/schemas/registry-org/list-registry-orgs-response.json
+++ b/schemas/registry-org/list-registry-orgs-response.json
@@ -158,7 +158,7 @@
             "properties": {
               "cve_website_update_date": {
                 "type": "string",
-                "format": "date-time"
+                "format": "date"
               },
               "cve_website_update_needed": {
                 "type": "boolean"
diff --git a/schemas/registry-org/update-registry-org-request.json b/schemas/registry-org/update-registry-org-request.json
index 5a4aa25a1..8690311f6 100644
--- a/schemas/registry-org/update-registry-org-request.json
+++ b/schemas/registry-org/update-registry-org-request.json
@@ -182,7 +182,7 @@
       "properties": {
         "cve_website_update_date": {
           "type": "string",
-          "format": "date-time"
+          "format": "date"
         },
         "cve_website_update_needed": {
           "type": "boolean"
diff --git a/src/model/baseorg.js b/src/model/baseorg.js
index e881bd0c3..e7e89e82f 100644
--- a/src/model/baseorg.js
+++ b/src/model/baseorg.js
@@ -1,6 +1,7 @@
 const mongoose = require('mongoose')
 const aggregatePaginate = require('mongoose-aggregate-paginate-v2')
 const MongoPaging = require('mongo-cursor-pagination')
+const { isValidDateOnlyString, normalizeDateOnlyInput } = require('../utils/dateOnly')
 
 const toUndefined = value => (value === '' ? undefined : value)
 
@@ -29,7 +30,14 @@ const schema = {
   partner_number: String,
   partner_country: String,
   program_data: {
-    cve_website_update_date: Date,
+    cve_website_update_date: {
+      type: String,
+      set: normalizeDateOnlyInput,
+      validate: {
+        validator: value => value == null || isValidDateOnlyString(value),
+        message: 'cve_website_update_date must be a date in YYYY-MM-DD format.'
+      }
+    },
     cve_website_update_needed: Boolean,
     partner_active_date: String,
     partner_inactive_date: String,
diff --git a/src/repositories/baseOrgRepository.js b/src/repositories/baseOrgRepository.js
index 40e235568..db131de10 100644
--- a/src/repositories/baseOrgRepository.js
+++ b/src/repositories/baseOrgRepository.js
@@ -16,6 +16,7 @@ const {
   createAuditLogEntry,
   handleAuthorityModelChange
 } = require('./baseOrgRepositoryHelpers')
+const { normalizeOrgCveWebsiteUpdateDate } = require('../utils/dateOnly')
 
 /**
  * @function setAggregateOrgObj
@@ -111,6 +112,7 @@ function getOrgProjection (isSecretariat = false) {
 function filterOrg (orgObj, isSecretariat = false) {
   const CONSTANTS = getConstants()
   const _ = require('lodash')
+  normalizeOrgCveWebsiteUpdateDate(orgObj, { output: true })
   let fieldsToOmit = [...CONSTANTS.ORG_EXCLUDED_FIELDS]
   if (!isSecretariat) {
     fieldsToOmit = [...fieldsToOmit, ...CONSTANTS.ORG_RESTRICTED_FIELDS]
@@ -399,6 +401,7 @@ class BaseOrgRepository extends BaseRepository {
         if (org.reports_to === null) {
           delete org.reports_to
         }
+        normalizeOrgCveWebsiteUpdateDate(org, { output: true })
       })
     }
 
@@ -475,6 +478,7 @@ class BaseOrgRepository extends BaseRepository {
       }
     }
 
+    normalizeOrgCveWebsiteUpdateDate(result, { output: true })
     return deepRemoveEmpty(result)
   }
 
@@ -913,6 +917,8 @@ class BaseOrgRepository extends BaseRepository {
     const originalPlain = orgObjectOriginal.toObject ? orgObjectOriginal.toObject() : orgObjectOriginal
     const originalSerialized = JSON.parse(JSON.stringify(originalPlain))
     const updatedSerialized = JSON.parse(JSON.stringify(orgObjectUpdated))
+    normalizeOrgCveWebsiteUpdateDate(originalSerialized, { output: true })
+    normalizeOrgCveWebsiteUpdateDate(updatedSerialized)
 
     // Filter the list to find only fields that have changed
     const changedFields = _.filter(jointApprovalFields, field => {
@@ -1034,6 +1040,8 @@ class BaseOrgRepository extends BaseRepository {
    * @returns {object} The validation result object.
    */
   validateOrg (org) {
+    normalizeOrgCveWebsiteUpdateDate(org)
+
     if (!org.authority || (Array.isArray(org.authority) && org.authority.length === 0)) {
       return { isValid: false, errors: [{ instancePath: '/authority', message: 'authority is required' }] }
     }
diff --git a/src/utils/dateOnly.js b/src/utils/dateOnly.js
new file mode 100644
index 000000000..ea96423ef
--- /dev/null
+++ b/src/utils/dateOnly.js
@@ -0,0 +1,68 @@
+const ISO_DATE_PREFIX = /^(\d{4})-(\d{2})-(\d{2})(?:$|T)/
+const ISO_DATE_ONLY = /^(\d{4})-(\d{2})-(\d{2})$/
+const MONGOOSE_DATE_STRING = /^[A-Z][a-z]{2} [A-Z][a-z]{2} \d{2} \d{4} .* GMT[+-]\d{4}/
+
+function isValidDateOnlyParts (year, month, day) {
+  const yearNumber = Number(year)
+  const monthNumber = Number(month)
+  const dayNumber = Number(day)
+  const date = new Date(Date.UTC(yearNumber, monthNumber - 1, dayNumber))
+
+  return (
+    date.getUTCFullYear() === yearNumber &&
+    date.getUTCMonth() === monthNumber - 1 &&
+    date.getUTCDate() === dayNumber
+  )
+}
+
+function isValidDateOnlyString (value) {
+  if (typeof value !== 'string') return false
+  const match = value.match(ISO_DATE_ONLY)
+  if (!match) return false
+  return isValidDateOnlyParts(match[1], match[2], match[3])
+}
+
+function normalizeDateOnlyInput (value) {
+  if (value instanceof Date) {
+    if (isNaN(value)) return value
+    return value.toISOString().split('T')[0]
+  }
+
+  if (typeof value !== 'string') return value
+
+  const match = value.match(ISO_DATE_PREFIX)
+  if (!match) return value
+  if (!isValidDateOnlyParts(match[1], match[2], match[3])) return value
+
+  return `${match[1]}-${match[2]}-${match[3]}`
+}
+
+function normalizeDateOnlyOutput (value) {
+  const normalizedValue = normalizeDateOnlyInput(value)
+  if (normalizedValue !== value) return normalizedValue
+
+  if (typeof value === 'string' && MONGOOSE_DATE_STRING.test(value)) {
+    const date = new Date(value)
+    if (!isNaN(date)) return date.toISOString().split('T')[0]
+  }
+
+  return value
+}
+
+function normalizeOrgCveWebsiteUpdateDate (org, options = {}) {
+  if (!org || typeof org !== 'object') return org
+  if (!org.program_data || typeof org.program_data !== 'object') return org
+  if (!Object.prototype.hasOwnProperty.call(org.program_data, 'cve_website_update_date')) return org
+
+  const normalize = options.output ? normalizeDateOnlyOutput : normalizeDateOnlyInput
+  org.program_data.cve_website_update_date = normalize(org.program_data.cve_website_update_date)
+
+  return org
+}
+
+module.exports = {
+  isValidDateOnlyString,
+  normalizeDateOnlyInput,
+  normalizeDateOnlyOutput,
+  normalizeOrgCveWebsiteUpdateDate
+}
diff --git a/test/integration-tests/registry-org/registryOrgCRUDTest.js b/test/integration-tests/registry-org/registryOrgCRUDTest.js
index b64cf16b5..a3f2e54e7 100644
--- a/test/integration-tests/registry-org/registryOrgCRUDTest.js
+++ b/test/integration-tests/registry-org/registryOrgCRUDTest.js
@@ -109,6 +109,36 @@ describe('Testing /registryOrg endpoints', () => {
             expect(res.body.created.vulnerability_advisory_location_for_web_scraping).to.deep.equal(['https://example.com/scraping'])
           })
       })
+      it('Creates a new registry org with a date-only CVE website update date', async () => {
+        const cveWebsiteUpdateDate = '2024-01-15'
+        const orgWithWebsiteUpdateDate = {
+          ...testRegistryOrg,
+          short_name: 'registry_org_test_web_date',
+          program_data: {
+            status: 'active',
+            cve_website_update_date: cveWebsiteUpdateDate
+          }
+        }
+
+        await chai.request(app)
+          .post('/api/registry/org')
+          .set(secretariatHeaders)
+          .send(orgWithWebsiteUpdateDate)
+          .then((res, err) => {
+            expect(err).to.be.undefined
+            expect(res).to.have.status(200)
+            expect(res.body.created).to.haveOwnProperty('program_data')
+            expect(res.body.created.program_data.cve_website_update_date).to.equal(cveWebsiteUpdateDate)
+          })
+
+        await chai.request(app)
+          .get('/api/registry/org/registry_org_test_web_date')
+          .set(secretariatHeaders)
+          .then((res) => {
+            expect(res).to.have.status(200)
+            expect(res.body.program_data.cve_website_update_date).to.equal(cveWebsiteUpdateDate)
+          })
+      })
     })
     context('Negative Tests', () => {
       it('Fails to create a new registry organization with an existing short name', async () => {
@@ -149,6 +179,27 @@ describe('Testing /registryOrg endpoints', () => {
             expect(res.body.message).to.equal('Parameters were invalid')
           })
       })
+      it('Fails to create a new registry organization with an ambiguous CVE website update date', async () => {
+        await chai.request(app)
+          .post('/api/registry/org')
+          .set(secretariatHeaders)
+          .send({
+            ...testRegistryOrg,
+            short_name: 'test_create_ambiguous_date',
+            program_data: {
+              status: 'active',
+              cve_website_update_date: '01/15/2024'
+            }
+          })
+          .then((res) => {
+            expect(res).to.have.status(400)
+            expect(res.body.message).to.equal('Parameters were invalid')
+
+            const dateError = res.body.errors.find(error => error.instancePath === '/program_data/cve_website_update_date')
+            expect(dateError).to.not.be.undefined
+            expect(dateError.message).to.equal('must match format "date"')
+          })
+      })
       it('Fails to create a new registry organization with reports_to manually provided', async () => {
         await chai.request(app)
           .post('/api/registry/org')
@@ -363,6 +414,7 @@ describe('Testing /registryOrg endpoints', () => {
       })
       it('Allows Secretariat to update program_data', async () => {
         const partnerActiveDate = '2024-01-15'
+        const cveWebsiteUpdateDate = '2024-04-10T18:30:00.000Z'
         await chai.request(app)
           .put('/api/registry/org/registry_org_test')
           .set(secretariatHeaders)
@@ -372,7 +424,8 @@ describe('Testing /registryOrg endpoints', () => {
             vulnerability_advisory_location_for_web_scraping: ['https://example.com/scraping'],
             program_data: {
               status: 'active',
-              partner_active_date: partnerActiveDate
+              partner_active_date: partnerActiveDate,
+              cve_website_update_date: cveWebsiteUpdateDate
             }
           })
           .then((res, err) => {
@@ -382,6 +435,7 @@ describe('Testing /registryOrg endpoints', () => {
             expect(res.body.updated.program_data.status).to.equal('active')
             expect(res.body.updated.program_data).to.haveOwnProperty('partner_active_date')
             expect(res.body.updated.program_data.partner_active_date).to.equal(partnerActiveDate)
+            expect(res.body.updated.program_data.cve_website_update_date).to.equal('2024-04-10')
             expect(res.body.updated.program_data).to.not.haveOwnProperty('advisory_location_require_credentials')
             expect(res.body.updated.program_data).to.not.haveOwnProperty('vulnerability_advisory_location_for_web_scraping')
             expect(res.body.updated.advisory_location_require_credentials).to.be.true