diff --git a/site/source/domain/Date.spec.ts b/site/source/domain/Date.spec.ts
index 9aae1337b..0ebc41efa 100644
--- a/site/source/domain/Date.spec.ts
+++ b/site/source/domain/Date.spec.ts
@@ -1,17 +1,22 @@
 import { describe, expect, it } from 'vitest'
 
-import { formatDate, parsePublicodesDateString } from '@/domain/Date'
+import {
+	parsePublicodesDateString,
+	PublicodeDate,
+	toPublicodeDate,
+} from '@/domain/Date'
 
 describe('parsePublicodesDateString', () => {
 	it('comprend 24-12-2024 comme le 24 décembre 2024', () => {
-		expect(parsePublicodesDateString('24/12/2024')).toEqual(
+		const publiCodeDate: PublicodeDate = '24/12/2024'
+		expect(parsePublicodesDateString(publiCodeDate)).toEqual(
 			new Date(2024, 11, 24)
 		)
 	})
 })
 
-describe('formatDate', () => {
+describe('toPublicodeDate', () => {
 	it("écrit le 15 août 1980 comme '15/08/1980' (format Publicodes)", () => {
-		expect(formatDate(new Date('1980-08-15'))).toEqual('15/08/1980')
+		expect(toPublicodeDate(new Date('1980-08-15'))).toEqual('15/08/1980')
 	})
 })
diff --git a/site/source/domain/Date.ts b/site/source/domain/Date.ts
index bb5306484..963840b66 100644
--- a/site/source/domain/Date.ts
+++ b/site/source/domain/Date.ts
@@ -1,10 +1,18 @@
 import { format, parse } from 'date-fns/fp'
 
+export type PublicodeDate =
+	`${number}${number}/${number}${number}/${number}${number}${number}${number}`
 export const publicodesStandardDateFormat = 'dd/MM/yyyy'
 
-export const formatDate = format(publicodesStandardDateFormat)
+type DateToPublicodeDate = (d: Date) => PublicodeDate
+
+export const toPublicodeDate = format(
+	publicodesStandardDateFormat
+) as DateToPublicodeDate
+
+type PublicodeDateToDate = (d: PublicodeDate) => Date
 
 export const parsePublicodesDateString = parse(
 	new Date(),
 	publicodesStandardDateFormat
-)
+) as PublicodeDateToDate
diff --git a/site/source/store/reducers/companySituationReducer.ts b/site/source/store/reducers/companySituationReducer.ts
index 34d3fde1d..d45f10279 100644
--- a/site/source/store/reducers/companySituationReducer.ts
+++ b/site/source/store/reducers/companySituationReducer.ts
@@ -1,7 +1,7 @@
 import { DottedName } from 'modele-social'
 
 import { CodeCatégorieJuridique } from '@/domain/CodeCatégorieJuridique'
-import { formatDate } from '@/domain/Date'
+import { toPublicodeDate } from '@/domain/Date'
 import { Entreprise } from '@/domain/Entreprise'
 import { Action } from '@/store/actions/actions'
 import { buildSituationFromObject, omit } from '@/utils'
@@ -85,7 +85,7 @@ export function companySituation(state: Situation = {}, action: Action) {
 
 export function getCompanySituation(entreprise: Entreprise): Situation {
 	return {
-		'entreprise . date de création': formatDate(entreprise.dateDeCréation),
+		'entreprise . date de création': toPublicodeDate(entreprise.dateDeCréation),
 		'entreprise . catégorie juridique': `'${getCatégorieFromCode(
 			entreprise.codeCatégorieJuridique
 		)}'`,