diff --git a/application/controllers/api/frontend/v1/betriebsmittel/BetriebsmittelP.php b/application/controllers/api/frontend/v1/betriebsmittel/BetriebsmittelP.php
index 7486f44f0..0ac3c8bca 100644
--- a/application/controllers/api/frontend/v1/betriebsmittel/BetriebsmittelP.php
+++ b/application/controllers/api/frontend/v1/betriebsmittel/BetriebsmittelP.php
@@ -259,7 +259,7 @@ class BetriebsmittelP extends FHCAPI_Controller
 		$kaution = $this->input->post('kaution');
 		if($kaution) $kaution = str_replace(',', '.', $kaution);
 		$ausgegebenam = $this->input->post('ausgegebenam');
-		$retouram = $this->input->post('retouram');
+		$retouram = $this->input->post('retouram') == "" ? null : $this->input->post('retouram');
 
 		// NOTE(chris): transform_kartennummer
 		if ($betriebsmitteltyp == 'Zutrittskarte' && $nummer)
diff --git a/application/controllers/api/frontend/v1/detailheader/Detailheader.php b/application/controllers/api/frontend/v1/detailheader/Detailheader.php
index 719afb2c6..89e9821eb 100644
--- a/application/controllers/api/frontend/v1/detailheader/Detailheader.php
+++ b/application/controllers/api/frontend/v1/detailheader/Detailheader.php
@@ -9,10 +9,10 @@ class Detailheader extends FHCAPI_Controller
 	public function __construct()
 	{
 		parent::__construct([
-			'getHeader' => self::PERM_LOGGED,
-			'getPersonAbteilung' => self::PERM_LOGGED,
-			'getLeitungOrg' => self::PERM_LOGGED,
-			'getSemesterStati' => self::PERM_LOGGED,
+			'getHeader' => ['vertrag/mitarbeiter:r', 'basis/mitarbeiter:r', 'admin:r', 'assistenz:r'],
+			'getPersonAbteilung' => ['vertrag/mitarbeiter:r', 'basis/mitarbeiter:r', 'admin:r', 'assistenz:r'],
+			'getLeitungOrg' => ['vertrag/mitarbeiter:r', 'basis/mitarbeiter:r', 'admin:r', 'assistenz:r'],
+			'getSemesterStati' => ['admin:r', 'assistenz:r'],
 		]);
 	}
 
diff --git a/application/controllers/api/frontend/v1/funktionen/Funktionen.php b/application/controllers/api/frontend/v1/funktionen/Funktionen.php
index b2787072b..a3efcdb51 100644
--- a/application/controllers/api/frontend/v1/funktionen/Funktionen.php
+++ b/application/controllers/api/frontend/v1/funktionen/Funktionen.php
@@ -294,6 +294,10 @@ class Funktionen extends FHCAPI_Controller
 		{
 			$this->terminateWithValidationErrors($this->form_validation->error_array());
 		}
+		if($datum_von == '')
+			$datum_von = null;
+		if($datum_bis == '')
+			$datum_bis = null;
 
 		$result = $this->BenutzerfunktionModel->update(
 			[
diff --git a/application/controllers/api/frontend/v1/stv/Abschlusspruefung.php b/application/controllers/api/frontend/v1/stv/Abschlusspruefung.php
index 42cf5b9c0..7c1c974e2 100644
--- a/application/controllers/api/frontend/v1/stv/Abschlusspruefung.php
+++ b/application/controllers/api/frontend/v1/stv/Abschlusspruefung.php
@@ -371,6 +371,9 @@ class Abschlusspruefung extends FHCAPI_Controller
 			$this->terminateWithValidationErrors($this->form_validation->error_array());
 		}
 
+		$datum = $formData['datum'] == '' ? null : $formData['datum'];
+		$sponsion = $formData['sponsion'] == '' ? null : $formData['sponsion'];
+
 		$result = $this->AbschlusspruefungModel->update(
 			[
 				'abschlusspruefung_id' => $abschlusspruefung_id
@@ -382,8 +385,8 @@ class Abschlusspruefung extends FHCAPI_Controller
 				'vorsitz' => $vorsitz,
 				'pruefungsantritt_kurzbz' => $formData['pruefungsantritt_kurzbz'],
 				'abschlussbeurteilung_kurzbz' => $formData['abschlussbeurteilung_kurzbz'],
-				'datum' => $formData['datum'],
-				'sponsion' => $formData['sponsion'],
+				'datum' => $datum,
+				'sponsion' => $sponsion,
 				'pruefer1' => $pruefer1,
 				'pruefer2' => $pruefer2,
 				'pruefer3' => $pruefer3,
diff --git a/application/controllers/api/frontend/v1/stv/Dokumente.php b/application/controllers/api/frontend/v1/stv/Dokumente.php
index 913a57dc4..b47a4af87 100644
--- a/application/controllers/api/frontend/v1/stv/Dokumente.php
+++ b/application/controllers/api/frontend/v1/stv/Dokumente.php
@@ -170,6 +170,8 @@ class Dokumente extends FHCAPI_Controller
 			$this->terminateWithValidationErrors($this->form_validation->error_array());
 		}
 
+		$nachgereicht_am =  $this->input->post('nachgereicht_am') == '' ? null : $this->input->post('nachgereicht_am');
+
 		$uid = getAuthUID();
 
 		$result = $this->AkteModel->update(
@@ -180,7 +182,7 @@ class Dokumente extends FHCAPI_Controller
 				'dokument_kurzbz' => $this->input->post('dokument_kurzbz'),
 				'anmerkung_intern' => $this->input->post('anmerkung_intern'),
 				'titel_intern' => $this->input->post('titel_intern'),
-				'nachgereicht_am' => $this->input->post('nachgereicht_am'),
+				'nachgereicht_am' => $nachgereicht_am,
 				'updateamum' => date('c'),
 				'updatevon' => $uid,
 			]
diff --git a/application/controllers/api/frontend/v1/stv/Konto.php b/application/controllers/api/frontend/v1/stv/Konto.php
index d59bc76b0..2654c18f6 100644
--- a/application/controllers/api/frontend/v1/stv/Konto.php
+++ b/application/controllers/api/frontend/v1/stv/Konto.php
@@ -429,9 +429,12 @@ class Konto extends FHCAPI_Controller
 			'updateamum' => date('c'),
 			'updatevon' => getAuthUID()
 		];
+
 		foreach ($allowed as $field)
 			if ($this->input->post($field) !== null)
 				$data[$field] = $this->input->post($field);
+			if($data['buchungsdatum'] == '')
+				$data['buchungsdatum'] = null;
 
 		$result = $this->KontoModel->update($id, $data);
 
diff --git a/application/controllers/api/frontend/v1/stv/Mobility.php b/application/controllers/api/frontend/v1/stv/Mobility.php
index f61816086..5639da549 100644
--- a/application/controllers/api/frontend/v1/stv/Mobility.php
+++ b/application/controllers/api/frontend/v1/stv/Mobility.php
@@ -237,8 +237,8 @@ class Mobility extends FHCAPI_Controller
 		}
 		$formData = $this->input->post('formData');
 
-		$von = $formData['von'] ?? null;
-		$bis = $formData['bis'] ?? null;
+		$von = ($formData['von'] ?? '') ?: null;
+		$bis = ($formData['bis'] ?? '') ?: null;
 		$nation_code = $formData['nation_code'] ?? null;
 		$mobilitaetsprogramm_code = $formData['mobilitaetsprogramm_code'] ?? null;
 		$herkunftsland_code = $formData['herkunftsland_code'] ?? null;
diff --git a/application/controllers/api/frontend/v1/stv/Prestudent.php b/application/controllers/api/frontend/v1/stv/Prestudent.php
index d8c8d1ff2..33957872f 100644
--- a/application/controllers/api/frontend/v1/stv/Prestudent.php
+++ b/application/controllers/api/frontend/v1/stv/Prestudent.php
@@ -193,7 +193,7 @@ class Prestudent extends FHCAPI_Controller
 				}
 				elseif (
 					$val === ''
-					&& in_array($prop, ['zgvnation', 'zgvmanation', 'zgvdoktornation', 'berufstaetigkeit_code', 'ausbildungcode'])
+					&& in_array($prop, ['zgvnation', 'zgvmanation', 'zgvdoktornation', 'berufstaetigkeit_code', 'ausbildungcode', 'zgvdatum', 'zgvmadatum'])
 				)
 				{
 					$val = null;
diff --git a/application/controllers/api/frontend/v1/stv/Pruefung.php b/application/controllers/api/frontend/v1/stv/Pruefung.php
index 4521c2033..becda03ee 100644
--- a/application/controllers/api/frontend/v1/stv/Pruefung.php
+++ b/application/controllers/api/frontend/v1/stv/Pruefung.php
@@ -448,8 +448,10 @@ class Pruefung extends FHCAPI_Controller
 			}
 		}
 
+		$datum = $this->input->post('datum') == '' ? null : $this->input->post('datum');
 		if(intval($pruefung_id) > 0)
 		{
+
 			$result = $this->PruefungModel->update(
 				[
 					'pruefung_id' => $pruefung_id
@@ -459,7 +461,7 @@ class Pruefung extends FHCAPI_Controller
 					'mitarbeiter_uid' =>  $this->input->post('mitarbeiter_uid'),
 					'note' => $this->input->post('note'),
 					'pruefungstyp_kurzbz' => $this->input->post('pruefungstyp_kurzbz'),
-					'datum' => $this->input->post('datum'),
+					'datum' => $datum,
 					'anmerkung' => $this->input->post('anmerkung'),
 					'updatevon' => $authUID,
 					'updateamum' => date('c'),
@@ -472,7 +474,7 @@ class Pruefung extends FHCAPI_Controller
 				'lehreinheit_id' => $this->input->post('lehreinheit_id'),
 				'student_uid' => $this->input->post('student_uid'),
 				'mitarbeiter_uid' => $this->input->post('mitarbeiter_uid'),
-				'datum' => $this->input->post('datum'),
+				'datum' => $datum,
 				'pruefungstyp_kurzbz' => $this->input->post('pruefungstyp_kurzbz'),
 				'note' => $this->input->post('note'),
 				'anmerkung' => $this->input->post('anmerkung'),
@@ -520,7 +522,7 @@ class Pruefung extends FHCAPI_Controller
 				'studiensemester_kurzbz' => $studiensemester_kurzbz,
 				'note' => $this->input->post('note'),
 				'uebernahmedatum' => date('c'),
-				'benotungsdatum' => $this->input->post('datum'),
+				'benotungsdatum' => $datum,
 				'insertamum' => date('c'),
 				'insertvon' =>  $authUID,
 				'punkte' => $this->input->post('punkte') ? str_replace(',', '.', $this->input->post('punkte')) : null
@@ -555,7 +557,7 @@ class Pruefung extends FHCAPI_Controller
 		], [
 			'note' => $this->input->post('note'),
 			'uebernahmedatum' => date('c'),
-			'benotungsdatum' => $this->input->post('datum'),
+			'benotungsdatum' => $datum,
 			'updateamum' => date('c'),
 			'updatevon' =>  $authUID,
 			'punkte' => $this->input->post('punkte') ? str_replace(',', '.', $this->input->post('punkte')) : null
diff --git a/application/controllers/api/frontend/v1/stv/Student.php b/application/controllers/api/frontend/v1/stv/Student.php
index 4ee37c954..943df7b91 100644
--- a/application/controllers/api/frontend/v1/stv/Student.php
+++ b/application/controllers/api/frontend/v1/stv/Student.php
@@ -297,6 +297,10 @@ class Student extends FHCAPI_Controller
 				$fotoval = ($val == '') ? null : str_replace('data:image/jpeg;base64,', '', $val);
 				$update_person[$prop] = $fotoval;
 			}
+			else if ($prop == 'gebdatum')
+			{
+				$update_person[$prop] = ($val == '') ? null : $val;
+			}
 			else
 			{
 				$update_person[$prop] = $val;
diff --git a/public/js/components/Betriebsmittel/Betriebsmittel.js b/public/js/components/Betriebsmittel/Betriebsmittel.js
index 08d6a8947..9f8290222 100644
--- a/public/js/components/Betriebsmittel/Betriebsmittel.js
+++ b/public/js/components/Betriebsmittel/Betriebsmittel.js
@@ -433,6 +433,7 @@ export default {
 						:label="$p.t('wawi/ausgegebenam')"
 						name="ausgegebenam"
 						v-model="formData.ausgegebenam"
+						model-type="yyyy-MM-dd"
 						auto-apply
 						:enable-time-picker="false"
 						text-input
@@ -449,6 +450,7 @@ export default {
 						:label="$p.t('wawi/retouram')"
 						name="retouram"
 						v-model="formData.retouram"
+						model-type="yyyy-MM-dd"
 						auto-apply
 						:enable-time-picker="false"
 						text-input
diff --git a/public/js/components/Funktionen/Funktionen.js b/public/js/components/Funktionen/Funktionen.js
index 2c1bce445..bf02995a1 100644
--- a/public/js/components/Funktionen/Funktionen.js
+++ b/public/js/components/Funktionen/Funktionen.js
@@ -551,6 +551,7 @@ export default {
 							container-class="mb-3 col-3"
 							type="DatePicker"
 							v-model="formData.datum_von"
+							model-type="yyyy-MM-dd"
 							name="datum_von"
 							:label="$p.t('ui/from') + ' *'"
 							auto-apply
@@ -566,6 +567,7 @@ export default {
 							container-class="mb-3 col-3"
 							type="DatePicker"
 							v-model="formData.datum_bis"
+							model-type="yyyy-MM-dd"
 							name="datum_bis"
 							:label="$p.t('global/bis')"
 							auto-apply
diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Aufnahmetermine/Aufnahmetermine.js b/public/js/components/Stv/Studentenverwaltung/Details/Aufnahmetermine/Aufnahmetermine.js
index 7f39496e9..a0e8c9465 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Aufnahmetermine/Aufnahmetermine.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Aufnahmetermine/Aufnahmetermine.js
@@ -470,6 +470,7 @@ export default {
 							:label="$p.t('admission', 'anmeldundRtAm')"
 							type="DatePicker"
 							v-model="formData.anmeldedatum"
+							model-type="yyyy-MM-dd"
 							auto-apply
 							:enable-time-picker="false"
 							text-input
diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Details.js b/public/js/components/Stv/Studentenverwaltung/Details/Details.js
index 9cd13c0a9..e457c2773 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Details.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Details.js
@@ -303,6 +303,7 @@ export default {
 						:label="$p.t('person', 'geburtsdatum')"
 						type="DatePicker"
 						v-model="data.gebdatum"
+						model-type="yyyy-MM-dd"
 						name="gebdatum"
 						:clearable="false"
 						no-today
diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Dokumente/Modal/Edit.js b/public/js/components/Stv/Studentenverwaltung/Details/Dokumente/Modal/Edit.js
index c96dcfd78..f536c016e 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Dokumente/Modal/Edit.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Dokumente/Modal/Edit.js
@@ -103,6 +103,7 @@ export default {
 						<form-input
 							type="DatePicker"
 							v-model="formData.nachgereicht_am"
+							model-type="yyyy-MM-dd"
 							name="nachgereicht_am"
 							:label="$p.t('dokumente/nachreichungAm')"
 							auto-apply
diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Konto.js b/public/js/components/Stv/Studentenverwaltung/Details/Konto.js
index 36e5bbbd3..5b6e1b6bb 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Konto.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Konto.js
@@ -27,7 +27,7 @@ export default {
 		return {
 			filter: false,
 			studiengang_kz: false,
-			counterdate: new Date()
+			counterdate: luxon.DateTime.now().setZone(FHC_JS_DATA_STORAGE_OBJECT.timezone).toISODate()
 		};
 	},
 	computed: {
@@ -259,6 +259,7 @@ export default {
 					<form-input
 						type="DatePicker"
 						v-model="counterdate"
+						model-type="yyyy-MM-dd"
 						input-group
 						:enable-time-picker="false"
 						text-input
diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Konto/Edit.js b/public/js/components/Stv/Studentenverwaltung/Details/Konto/Edit.js
index 200a15a0d..f501c1a67 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Konto/Edit.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Konto/Edit.js
@@ -79,6 +79,7 @@ export default {
 				<form-input
 					type="DatePicker"
 					v-model="data.buchungsdatum"
+					model-type="yyyy-MM-dd"
 					name="buchungsdatum"
 					:label="$p.t('konto/buchungsdatum')"
 					:enable-time-picker="false"
diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Konto/New.js b/public/js/components/Stv/Studentenverwaltung/Details/Konto/New.js
index 4060b5961..19aa7a867 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Konto/New.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Konto/New.js
@@ -88,7 +88,7 @@ export default {
 			this.data = {
 				buchungstyp_kurzbz: '',
 				betrag: '-0.00',
-				buchungsdatum: new Date(),
+				buchungsdatum: luxon.DateTime.now().setZone(FHC_JS_DATA_STORAGE_OBJECT.timezone).toISODate(),
 				buchungstext: '',
 				mahnspanne: 30,
 				studiensemester_kurzbz: this.currentSemester,
@@ -154,6 +154,7 @@ export default {
 				<form-input
 					type="DatePicker"
 					v-model="data.buchungsdatum"
+					model-type="yyyy-MM-dd"
 					name="buchungsdatum"
 					:label="$p.t('konto/buchungsdatum')"
 					:enable-time-picker="false"
diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Mobility/Mobility.js b/public/js/components/Stv/Studentenverwaltung/Details/Mobility/Mobility.js
index e71c0dfb8..dd2899bf1 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Mobility/Mobility.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Mobility/Mobility.js
@@ -467,6 +467,7 @@ export default {
 						:label="$p.t('ui', 'von')"
 						type="DatePicker"
 						v-model="formData.von"
+						model-type="yyyy-MM-dd"
 						auto-apply
 						:enable-time-picker="false"
 						text-input
@@ -501,6 +502,7 @@ export default {
 						:label="$p.t('global', 'bis')"
 						type="DatePicker"
 						v-model="formData.bis"
+						model-type="yyyy-MM-dd"
 						auto-apply
 						:enable-time-picker="false"
 						text-input
diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Prestudent.js b/public/js/components/Stv/Studentenverwaltung/Details/Prestudent.js
index 5f70e4951..1d8d5ac26 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Prestudent.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Prestudent.js
@@ -325,6 +325,7 @@ export default {
 						:label="$p.t('infocenter', 'zgvDatum')"
 						type="DatePicker"
 						v-model="data.zgvdatum"
+						model-type="yyyy-MM-dd"
 						name="zgvdatum"
 						no-today
 						auto-apply
@@ -389,6 +390,7 @@ export default {
 						:label="$p.t('lehre', 'zgvMasterDatum')"
 						type="DatePicker"
 						v-model="data.zgvmadatum"
+						model-type="yyyy-MM-dd"
 						name="zgvmadatum"
 						no-today
 						auto-apply
@@ -454,6 +456,7 @@ export default {
 						:label="$p.t('lehre', 'zgvDoktorDatum')"
 						type="DatePicker"
 						v-model="data.zgvdoktordatum"
+						model-type="yyyy-MM-dd"
 						name="zgvdoktordatum"
 						no-today
 						auto-apply
diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Status/Modal.js b/public/js/components/Stv/Studentenverwaltung/Details/Status/Modal.js
index 7507b0ebd..ce190fdb5 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Status/Modal.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Status/Modal.js
@@ -276,6 +276,7 @@ export default{
 				container-class="mb-3"
 				type="DatePicker"
 				v-model="formData.datum"
+				model-type="yyyy-MM-dd"
 				name="datum"
 				:label="$p.t('global/datum')"
 				auto-apply
@@ -291,6 +292,7 @@ export default{
 				container-class="mb-3"
 				type="DatePicker"
 				v-model="formData.bestaetigtam"
+				model-type="yyyy-MM-dd"
 				name="bestaetigtam"
 				:label="$p.t('lehre/bestaetigt_am')"
 				auto-apply
@@ -306,13 +308,14 @@ export default{
 				container-class="mb-3"
 				type="DatePicker"
 				v-model="formData.bewerbung_abgeschicktamum"
+				model-type="yyyy-MM-dd HH:mm:ss"
 				name="bewerbung_abgeschicktamum"
 				:label="$p.t('lehre/bewerbung_abgeschickt_am')"
 				auto-apply
-				:enable-time-picker="false"
-				format="dd.MM.yyyy"
+				:enable-time-picker="true"
+				format="dd.MM.yyyy HH:mm:ss"
 				text-input
-				preview-format="dd.MM.yyyy"
+				preview-format="dd.MM.yyyy HH:mm:ss"
 				:teleport="true"
 				:disabled="bisLocked || !hasPrestudentstatusPermission"
 				>
diff --git a/public/js/components/Stv/Studentenverwaltung/List/New.js b/public/js/components/Stv/Studentenverwaltung/List/New.js
index 6b7df3581..90d4e498b 100644
--- a/public/js/components/Stv/Studentenverwaltung/List/New.js
+++ b/public/js/components/Stv/Studentenverwaltung/List/New.js
@@ -285,6 +285,7 @@ export default {
 								uid="stv-list-new-gebdatum"
 								name="gebdatum"
 								v-model="formDataPerson['gebdatum']"
+								model-type="yyyy-MM-dd"
 								:disabled="!!person"
 								@update:model-value="loadSuggestions"
 								text-input