diff --git a/app/(main)/devis/acceptes/page.tsx b/app/(main)/devis/acceptes/page.tsx
index 01b461a..8c2032d 100644
--- a/app/(main)/devis/acceptes/page.tsx
+++ b/app/(main)/devis/acceptes/page.tsx
@@ -512,23 +512,23 @@ RECOMMANDATIONS:
 
                                     <div className="field col-12 md:col-6">
                                         <label htmlFor="dateDebut">Date de début</label>
-                                        <Calendar 
-                                            id="dateDebut" 
-                                            value={chantierData.dateDebut} 
-                                            onChange={(e) => setChantierData(prev => ({ ...prev, dateDebut: e.value || new Date() }))} 
-                                            dateFormat="dd/mm/yy" 
-                                            showIcon 
+                                        <Calendar
+                                            id="dateDebut"
+                                            value={chantierData.dateDebut}
+                                            onChange={(e) => setChantierData(prev => ({ ...prev, dateDebut: e.value?.toISOString() || new Date().toISOString() }))}
+                                            dateFormat="dd/mm/yy"
+                                            showIcon
                                         />
                                     </div>
 
                                     <div className="field col-12 md:col-6">
                                         <label htmlFor="dateFinPrevue">Date de fin prévue</label>
-                                        <Calendar 
-                                            id="dateFinPrevue" 
-                                            value={chantierData.dateFinPrevue} 
-                                            onChange={(e) => setChantierData(prev => ({ ...prev, dateFinPrevue: e.value || new Date() }))} 
-                                            dateFormat="dd/mm/yy" 
-                                            showIcon 
+                                        <Calendar
+                                            id="dateFinPrevue"
+                                            value={chantierData.dateFinPrevue}
+                                            onChange={(e) => setChantierData(prev => ({ ...prev, dateFinPrevue: e.value?.toISOString() || new Date().toISOString() }))}
+                                            dateFormat="dd/mm/yy"
+                                            showIcon
                                             minDate={chantierData.dateDebut}
                                         />
                                     </div>
diff --git a/app/(main)/devis/expires/page.tsx b/app/(main)/devis/expires/page.tsx
index 749a115..21d74c5 100644
--- a/app/(main)/devis/expires/page.tsx
+++ b/app/(main)/devis/expires/page.tsx
@@ -532,12 +532,12 @@ RECOMMANDATIONS:
                                 <>
                                     <div className="field col-12 md:col-6">
                                         <label htmlFor="newValidityDate">Nouvelle date de validité</label>
-                                        <Calendar 
-                                            id="newValidityDate" 
-                                            value={renewData.newValidityDate} 
-                                            onChange={(e) => setRenewData(prev => ({ ...prev, newValidityDate: e.value || new Date() }))} 
-                                            dateFormat="dd/mm/yy" 
-                                            showIcon 
+                                        <Calendar
+                                            id="newValidityDate"
+                                            value={renewData.newValidityDate}
+                                            onChange={(e) => setRenewData(prev => ({ ...prev, newValidityDate: e.value?.toISOString() || new Date().toISOString() }))}
+                                            dateFormat="dd/mm/yy"
+                                            showIcon
                                             minDate={new Date()}
                                         />
                                     </div>
diff --git a/app/(main)/factures/export/page.tsx b/app/(main)/factures/export/page.tsx
index be49872..73ef86f 100644
--- a/app/(main)/factures/export/page.tsx
+++ b/app/(main)/factures/export/page.tsx
@@ -347,7 +347,7 @@ const FactureExportPage = () => {
                                 <Calendar
                                     id="dateDebut"
                                     value={config.dateDebut}
-                                    onChange={(e) => setConfig(prev => ({ ...prev, dateDebut: e.value || new Date() }))}
+                                    onChange={(e) => setConfig(prev => ({ ...prev, dateDebut: e.value?.toISOString() || new Date().toISOString() }))}
                                     className="w-full"
                                     dateFormat="dd/mm/yy"
                                 />
@@ -360,7 +360,7 @@ const FactureExportPage = () => {
                                 <Calendar
                                     id="dateFin"
                                     value={config.dateFin}
-                                    onChange={(e) => setConfig(prev => ({ ...prev, dateFin: e.value || new Date() }))}
+                                    onChange={(e) => setConfig(prev => ({ ...prev, dateFin: e.value?.toISOString() || new Date().toISOString() }))}
                                     className="w-full"
                                     dateFormat="dd/mm/yy"
                                 />
diff --git a/app/(main)/factures/impayees/page.tsx b/app/(main)/factures/impayees/page.tsx
index 9311c69..778f007 100644
--- a/app/(main)/factures/impayees/page.tsx
+++ b/app/(main)/factures/impayees/page.tsx
@@ -548,12 +548,12 @@ RECOMMANDATIONS:
                                 <>
                                     <div className="field col-12 md:col-6">
                                         <label htmlFor="datePaiement">Date de paiement</label>
-                                        <Calendar 
-                                            id="datePaiement" 
-                                            value={paymentData.datePaiement} 
-                                            onChange={(e) => setPaymentData(prev => ({ ...prev, datePaiement: e.value || new Date() }))} 
-                                            dateFormat="dd/mm/yy" 
-                                            showIcon 
+                                        <Calendar
+                                            id="datePaiement"
+                                            value={paymentData.datePaiement}
+                                            onChange={(e) => setPaymentData(prev => ({ ...prev, datePaiement: e.value?.toISOString() || new Date().toISOString() }))}
+                                            dateFormat="dd/mm/yy"
+                                            showIcon
                                         />
                                     </div>
 
diff --git a/app/(main)/factures/nouvelle/page.tsx b/app/(main)/factures/nouvelle/page.tsx
index 8c8ac6e..357fa68 100644
--- a/app/(main)/factures/nouvelle/page.tsx
+++ b/app/(main)/factures/nouvelle/page.tsx
@@ -206,7 +206,7 @@ const NouvelleFacturePage = () => {
             tauxTVA: selectedDevis.tauxTVA || 20,
             montantTVA: selectedDevis.montantTVA || 0,
             montantTTC: selectedDevis.montantTTC || 0,
-            client: selectedDevis.client?.id || null,
+            client: selectedDevis.client || null,
             devis: selectedDevis.id,
             lignes: selectedDevis.lignes?.map(ligneDevis => ({
                 id: '',
diff --git a/app/(main)/factures/relances/[id]/page.tsx b/app/(main)/factures/relances/[id]/page.tsx
index 6917bc8..348c8eb 100644
--- a/app/(main)/factures/relances/[id]/page.tsx
+++ b/app/(main)/factures/relances/[id]/page.tsx
@@ -548,7 +548,7 @@ const FactureRelancePage = () => {
                             <Calendar
                                 id="dateEnvoi"
                                 value={nouvelleRelance.dateEnvoi}
-                                onChange={(e) => setNouvelleRelance(prev => ({ ...prev, dateEnvoi: e.value || new Date() }))}
+                                onChange={(e) => setNouvelleRelance(prev => ({ ...prev, dateEnvoi: e.value?.toISOString() || new Date().toISOString() }))}
                                 className="w-full"
                                 dateFormat="dd/mm/yy"
                                 showTime
diff --git a/app/(main)/factures/retard/page.tsx b/app/(main)/factures/retard/page.tsx
index 4044aff..16e90db 100644
--- a/app/(main)/factures/retard/page.tsx
+++ b/app/(main)/factures/retard/page.tsx
@@ -611,12 +611,12 @@ ACTIONS RECOMMANDÉES:
 
                                     <div className="field col-12 md:col-6">
                                         <label htmlFor="deadline">Délai de règlement</label>
-                                        <Calendar 
-                                            id="deadline" 
-                                            value={urgentReminderData.deadline} 
-                                            onChange={(e) => setUrgentReminderData(prev => ({ ...prev, deadline: e.value || new Date() }))} 
-                                            dateFormat="dd/mm/yy" 
-                                            showIcon 
+                                        <Calendar
+                                            id="deadline"
+                                            value={urgentReminderData.deadline}
+                                            onChange={(e) => setUrgentReminderData(prev => ({ ...prev, deadline: e.value?.toISOString() || new Date().toISOString() }))}
+                                            dateFormat="dd/mm/yy"
+                                            showIcon
                                             minDate={new Date()}
                                         />
                                     </div>
@@ -649,12 +649,12 @@ ACTIONS RECOMMANDÉES:
 
                                     <div className="field col-12 md:col-6">
                                         <label htmlFor="legalDeadline">Délai de mise en demeure</label>
-                                        <Calendar 
-                                            id="legalDeadline" 
-                                            value={legalNoticeData.deadline} 
-                                            onChange={(e) => setLegalNoticeData(prev => ({ ...prev, deadline: e.value || new Date() }))} 
-                                            dateFormat="dd/mm/yy" 
-                                            showIcon 
+                                        <Calendar
+                                            id="legalDeadline"
+                                            value={legalNoticeData.deadline}
+                                            onChange={(e) => setLegalNoticeData(prev => ({ ...prev, deadline: e.value?.toISOString() || new Date().toISOString() }))}
+                                            dateFormat="dd/mm/yy"
+                                            showIcon
                                             minDate={new Date()}
                                         />
                                     </div>